chore: update monero to latest release (#6098)

Description
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Updated monero (Rust Monero Library) to the latest release.

Motivation and Context
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Many vulnerabilities have been fixed since the previous release,
including findings die to the recent code audit.

How Has This Been Tested?
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Unit tests

What process can a PR reviewer use to test or verify this change?
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Review CI results

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Breaking Changes
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- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

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applications/minotari_merge_mining_proxy/Cargo.toml

@@ -35,7 +35,7 @@ hex = "0.4.2"
 hyper = "0.14.12"
 jsonrpc = "0.12.0"
 log = { version = "0.4.8", features = ["std"] }
-monero = { version = "0.18" }
+monero = { version = "0.20.0" }
 reqwest = { version = "0.11.4", features = ["json"] }
 serde = { version = "1.0.106", features = ["derive"] }
 serde_json = "1.0.57"