chore: bump rustc to v1.95.0

[mraszyk]

This PR bumps the Rust version to v1.95.0.

The original PR performing that bump had to be reverted since it broke a few tests.

Canbench summaries

Regressions

Inside bench_icrc1_transfers the upgrade path got slightly more expensive, offset by larger wins elsewhere so the benchmark total still improved (u64 −6.65%, u256 −6.54%):

Suite	Scope	Instructions	Δ
ICRC1 ledger (u64)	bench_icrc1_transfers::post_upgrade	379.10 M	+8.02%
ICRC1 ledger (u64)	bench_icrc1_transfers::upgrade	528.83 M	+5.85%
ICRC1 ledger (u256)	bench_icrc1_transfers::post_upgrade	379.28 M	+7.98%
ICRC1 ledger (u256)	bench_icrc1_transfers::upgrade	529.25 M	+5.87%

ckBTC minter — //rs/bitcoin/ckbtc/minter:ckbtc_minter_canbench

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 7 | regressed 0 | improved 7 | new 0 | unchanged 0]
change: [max -163.59K | p75 -163.72K | median -163.76K | p25 -163.76K | min -164.87K]
change %: [max -38.40% | p75 -38.73% | median -38.79% | p25 -38.82% | min -39.00%]

heap_increase:
status: No significant changes 👍
counts: [total 7 | regressed 0 | improved 0 | new 0 | unchanged 7]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 7 | regressed 0 | improved 0 | new 0 | unchanged 7]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

ckETH minter — //rs/ethereum/cketh/minter:cketh_minter_canbench

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 1 | regressed 0 | improved 1 | new 0 | unchanged 0]
change: [max -108.89M | p75 -108.89M | median -108.89M | p25 -108.89M | min -108.89M]
change %: [max -11.11% | p75 -11.11% | median -11.11% | p25 -11.11% | min -11.11%]

heap_increase:
status: No significant changes 👍
counts: [total 1 | regressed 0 | improved 0 | new 0 | unchanged 1]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 1 | regressed 0 | improved 0 | new 0 | unchanged 1]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

ICP ledger — //rs/ledger_suite/icp/ledger:ledger_canbench

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 1 | regressed 0 | improved 1 | new 0 | unchanged 0]
change: [max -308.42M | p75 -308.42M | median -308.42M | p25 -308.42M | min -308.42M]
change %: [max -2.14% | p75 -2.14% | median -2.14% | p25 -2.14% | min -2.14%]

heap_increase:
status: No significant changes 👍
counts: [total 1 | regressed 0 | improved 0 | new 0 | unchanged 1]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 1 | regressed 0 | improved 0 | new 0 | unchanged 1]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

ICRC1 ledger (u64) — //rs/ledger_suite/icrc1/ledger:canbench_u64

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 2 | regressed 0 | improved 1 | new 0 | unchanged 1]
change: [max -20.89K | p75 -871.88M | median -1.74B | p25 -2.62B | min -3.49B]
change %: [max -0.24% | p75 -1.84% | median -3.45% | p25 -5.05% | min -6.65%]

heap_increase:
status: No significant changes 👍
counts: [total 2 | regressed 0 | improved 0 | new 0 | unchanged 2]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 2 | regressed 0 | improved 0 | new 0 | unchanged 2]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

ICRC1 ledger (u256) — //rs/ledger_suite/icrc1/ledger:canbench_u256

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 2 | regressed 0 | improved 1 | new 0 | unchanged 1]
change: [max -21.13K | p75 -883.02M | median -1.77B | p25 -2.65B | min -3.53B]
change %: [max -0.24% | p75 -1.82% | median -3.39% | p25 -4.97% | min -6.54%]

heap_increase:
status: No significant changes 👍
counts: [total 2 | regressed 0 | improved 0 | new 0 | unchanged 2]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 2 | regressed 0 | improved 0 | new 0 | unchanged 2]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

NNS governance — //rs/nns/governance:governance-canbench

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 28 | regressed 0 | improved 2 | new 0 | unchanged 26]
change: [max +386.55K | p75 -1.25K | median -69.16K | p25 -643.88K | min -3.58M]
change %: [max +0.77% | p75 -1.31% | median -2.30% | p25 -3.30% | min -7.68%]

heap_increase:
status: No significant changes 👍
counts: [total 28 | regressed 0 | improved 0 | new 0 | unchanged 28]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 28 | regressed 0 | improved 0 | new 0 | unchanged 28]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

Registry canister — //rs/registry/canister:registry-canbench

Summary:
instructions:
status: Improvements detected 🟢
counts: [total 14 | regressed 0 | improved 9 | new 0 | unchanged 5]
change: [max -7 | p75 -882.83K | median -6.26M | p25 -18.58M | min -424.07M]
change %: [max -0.01% | p75 -0.48% | median -2.75% | p25 -4.74% | min -6.67%]

heap_increase:
status: No significant changes 👍
counts: [total 14 | regressed 0 | improved 0 | new 0 | unchanged 14]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

stable_memory_increase:
status: No significant changes 👍
counts: [total 14 | regressed 0 | improved 0 | new 0 | unchanged 14]
change: [max 0 | p75 0 | median 0 | p25 0 | min 0]
change %: [max 0.00% | p75 0.00% | median 0.00% | p25 0.00% | min 0.00%]

[github-actions]

Run URL: https://github.com/dfinity/ic/actions/runs/29117922275

New container images with tag: 285e2d5f1b7bc3735765c70b70504aad04c171c7ee7ebae00c03f24d608cd688
ic-build: sha256:88eab17245eb00929dddf0eadbab2e359952e06c440c890420ba257409e30149
ic-dev: sha256:eae27468101cff14340905c9b6d1fc6caebe339c7ed474d8fee6d35015c04d61

[github-actions]

This pull request changes code owned by the Governance team. Therefore, make sure that
you have considered the following (for Governance-owned code):

1. Update unreleased_changelog.md (if there are behavior changes, even if they are
   non-breaking).

2. Are there BREAKING changes?

3. Is a data migration needed?

4. Security review?

How to Satisfy This Automatic Review

1. Go to the bottom of the pull request page.

2. Look for where it says this bot is requesting changes.

3. Click the three dots to the right.

4. Select "Dismiss review".

5. In the text entry box, respond to each of the numbered items in the previous
   section, declare one of the following:

• Done.

• $REASON_WHY_NO_NEED. E.g. for unreleased_changelog.md, "No
  canister behavior changes.", or for item 2, "Existing APIs
  behave as before.".

Brief Guide to "Externally Visible" Changes

"Externally visible behavior change" is very often due to some NEW canister API.

Changes to EXISTING APIs are more likely to be "breaking".

If these changes are breaking, make sure that clients know how to migrate, how to
maintain their continuity of operations.

If your changes are behind a feature flag, then, do NOT add entrie(s) to
unreleased_changelog.md in this PR! But rather, add entrie(s) later, in the PR
that enables these changes in production.

Reference(s)

For a more comprehensive checklist, see here.

GOVERNANCE_CHECKLIST_REMINDER_DEDUP

No canister behavior changes.

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 5c0fe78.

Security Overview

• 🔎 Scanned files: 13 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/14c3f6d7-8c8e-4a33-9b18-2f289f25b557?scanId=c8c41eca-8f93-47a4-9823-d89a7c18451c&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Configuration changes	► .devcontainer/devcontainer.json     No newline at end of file addition? (context)
Enhancement	► bazel/rust.MODULE.bazel     Update Rust toolchain edition and version from 1.93.1 to 1.95.0 ► rust-toolchain.toml     Update channel from 1.93.1 to 1.95.0
Enhancement	► publish/canisters/BUILD.bazel     Update canister size constraint comment and wasm.gz entry for ic-ckbtc-minter.wasm.gz from 9 to 10 and add note about current size
Enhancement	► rs/bitcoin/ckbtc/minter/canbench/results.yml     Update various benchmark instruction counts and related values (multiple fields)
Enhancement	► rs/ethereum/cketh/minter/canbench/results.yml     Update benchmark instruction counts and version from 0.4.0 to 0.6.0
Enhancement	► rs/ledger_suite/icp/ledger/canbench_results/canbench.yml     Adjust total/endpoint instruction counts and version from 0.1.9 to 0.6.0 ► rs/ledger_suite/icrc1/ledger/canbench_results/canbench_u256.yml     Update multiple instruction counts; version from 0.6.0 remains same ► rs/ledger_suite/icrc1/ledger/canbench_results/canbench_u64.yml     Update multiple instruction counts; version from 0.6.0 remains same ► rs/nns/governance/canbench/canbench_results.yml     Update numerous instruction counts across many benches to new values; version from 0.4.1 to 0.6.0 ► rs/registry/canister/canbench/canbench_results.yml     Update numerous instruction counts; version from 0.6.0 remains same ► rs/sns/sns.bzl     Increase max compressed wasm size for sns-governance-canister.wasm.gz and sns-governance-canister_test.wasm.gz from 19/20 to 23/24 ► rust-toolchain.toml     Mirror change to channel from 1.93.1 to 1.95.0

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 5c0fe78.

Security Overview

• 🔎 Scanned files: 13 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/783a9bd4-fb4e-4e10-ab3c-c2fb2ddfb92f?scanId=fc37c36a-2520-4e7f-90ff-15211119b5f2&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► bazel/rust.MODULE.bazel      Update Rust toolchain version from 1.93.1 to 1.95.0
Enhancement	► rust-toolchain.toml      Bump channel from 1.93.1 to 1.95.0 ► rust-toolchain.toml      Set targets to wasm32-unknown-unknown ► rust-toolchain.toml      Set profile to default
Enhancement	► .devcontainer/devcontainer.json      No newline at end of file (existing formatting preserved)
Enhancement	► publish/canisters/BUILD.bazel      Update ic-ckbtc-minter.wasm.gz size classification to 10 (was 9); add comment about current size
Enhancement	► rs/bitcoin/ckbtc/minter/canbench/results.yml      Update instruction counts for multiple benches (decrease in many totals)
Enhancement	► rs/ethereum/cketh/minter/canbench/results.yml      Update total instructions and version from 0.4.0 to 0.6.0
Enhancement	► rs/ledger_suite/icp/ledger/canbench_results/canbench.yml      Update instruction counts and version from 0.1.9 to 0.6.0
Enhancement	► rs/ledger_suite/icrc1/ledger/canbench_results/canbench_u256.yml      Update numerous instruction counts; version from 0.6.0 remains 0.6.0 (unchanged)
Enhancement	► rs/ledger_suite/icrc1/ledger/canbench_results/canbench_u64.yml      Update numerous instruction counts; version from 0.6.0 remains 0.6.0 (unchanged)
Enhancement	► rs/nns/governance/canbench/canbench_results.yml      Update numerous instruction counts across benches (increased counts)
Enhancement	► rs/registry/canister/canbench/canbench_results.yml      Update several instruction counts (decreases in many benches)
Enhancement	► rs/recovery/subnet_splitting/tests/integration_tests.rs      Adjust expected metric values (loads and counts) and ingress/local estimates
Enhancement	► rs/sns/sns.bzl      Increase CANISTER_NAME_TO_MAX_COMPRESSED_WASM_SIZE_E5_BYTES for two SNS canisters
Enhancement	► a/.devcontainer/devcontainer.json      Minor formatting change (no newline at end)

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 5c0fe78.

Security Overview

• 🔎 Scanned files: 13 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/f975f1a5-0a47-4a3b-b7f0-a55609e90390?scanId=f8dc9492-d711-4770-92e0-72b0c8dfcc55&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Configuration changes	► .devcontainer/devcontainer.json     No newline at end of file addition? (context)
Enhancement	► bazel/rust.MODULE.bazel     Update Rust toolchain edition and version from 1.93.1 to 1.95.0 ► rust-toolchain.toml     Update channel from 1.93.1 to 1.95.0
Enhancement	► publish/canisters/BUILD.bazel     Update canister size constraint comment and wasm.gz entry for ic-ckbtc-minter.wasm.gz from 9 to 10 and add note about current size
Enhancement	► rs/bitcoin/ckbtc/minter/canbench/results.yml     Update various benchmark instruction counts and related values (multiple fields)
Enhancement	► rs/ethereum/cketh/minter/canbench/results.yml     Update benchmark instruction counts and version from 0.4.0 to 0.6.0
Enhancement	► rs/ledger_suite/icp/ledger/canbench_results/canbench.yml     Adjust total/endpoint instruction counts and version from 0.1.9 to 0.6.0 ► rs/ledger_suite/icrc1/ledger/canbench_results/canbench_u256.yml     Update multiple instruction counts; version from 0.6.0 remains same ► rs/ledger_suite/icrc1/ledger/canbench_results/canbench_u64.yml     Update multiple instruction counts; version from 0.6.0 remains same ► rs/nns/governance/canbench/canbench_results.yml     Update numerous instruction counts across many benches to new values; version from 0.4.1 to 0.6.0 ► rs/registry/canister/canbench/canbench_results.yml     Update numerous instruction counts; version from 0.6.0 remains same ► rs/sns/sns.bzl     Increase max compressed wasm size for sns-governance-canister.wasm.gz and sns-governance-canister_test.wasm.gz from 19/20 to 23/24 ► rust-toolchain.toml     Mirror change to channel from 1.93.1 to 1.95.0

[mbjorkqvist]

Thanks @mraszyk!