[rust] Update code to support 1.83 in clippy

[gregnazario]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the codebase to support Rust 1.83 in clippy by adjusting lint attributes, lifetime annotations, and CI tooling versions. Key changes include:

• Adjusting lint allow attributes in tests and source files (e.g. replacing unit_arg with new Clippy lints).
• Updating lifetime parameters in various Serialize/Deserialize trait implementations to use underscore lifetimes.
• Upgrading GitHub Actions versions and toolchain settings in CI workflows.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/serde.rs	Added a new lint allowance and updated constant usage from u64::max_value() to u64::MAX.
src/ser.rs	Replaced explicit lifetime parameters with underscore lifetimes in serializer trait implementations.
src/de.rs	Simplified lifetime declarations and updated Clippy lint allowances in deserializer implementations.
.github/workflows/rustdoc.yml	Upgraded GitHub Actions versions for repository checkout and docs deployment.
.github/workflows/ci.yml	Upgraded checkout action, updated toolchain version, and refined the clippy command to skip deps.