[deps]: Pin rust to 1.97.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rust (source, changelog)	uses-with	pin	stable → 1.97.1

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[bitwarden-bot]

Internal tracking:

• ID: PM-40591
• Link: https://bitwarden.atlassian.net/browse/PM-40591

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.42%. Comparing base (63e1c66) to head (d3e613a).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8015   +/-   ##
=======================================
  Coverage   62.42%   62.42%           
=======================================
  Files        2289     2289           
  Lines       99712    99712           
  Branches     9004     9004           
=======================================
  Hits        62250    62250           
  Misses      35290    35290           
  Partials     2172     2172           

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[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This Renovate PR pins the Rust toolchain in the CI test job (.github/workflows/test.yml) from the floating stable channel to an explicit 1.97.1. This improves build determinism and is a routine Stage 5 dependency-monitoring change. No source code, manifests, or lock files are affected.

Code Review Details

No blocking findings.

Dependency Changes

Package	Change	Ecosystem
rust (CI toolchain)	stable → 1.97.1 (pin)	GitHub Actions

Note: util/RustSdk/rust-toolchain.toml remains pinned at 1.94.1 for building the RustSdk crate. This is a separate, pre-existing version specification serving a different purpose (cargo build vs. CI test toolchain), and the difference is not introduced by this change.