chore: update CI minimum to 1.81.0 #2

chore: update CI minimum to 1.81.0

Usage Workflow file

15 warnings

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3, actions-rs/[email protected], actions-rs/[email protected]. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

unused import: `backtrace::Frame`

unused import: `backtrace::Symbol`

lint `box_pointers` has been removed: it does not detect other kinds of allocations, and existed only for historical reasons

methods `symbol_address` and `ip` are never used

`pprof2` (lib) generated 4 warnings (run `cargo fix --lib -p pprof2` to apply 2 suggestions)

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

unused import: `backtrace::Frame`

unused import: `backtrace::Symbol`

methods `symbol_address` and `ip` are never used

`pprof2` (lib) generated 3 warnings (run `cargo fix --lib -p pprof2` to apply 2 suggestions)