chore: update librarian

[joshuatants]

To pick up googleapis/librarian#7492

[gemini-code-assist]

Code Review

This pull request contains auto-generated updates across multiple Google Cloud Rust SDK crates. Key changes include expanding conditional compilation attributes (#[cfg(any(...))]) for ToProto and FromProto implementations to support additional services and features, removing redundant #[allow(unused_imports)] and #[allow(dead_code)] attributes, and updating documentation comments to refer to 'gRPC client' instead of 'Tonic-generated client'. Additionally, the Tether service in apigeeconnect was refactored to use a gRPC client instead of an HTTP client, and Debug implementations for various transport services were simplified. No review comments were provided, so there is no feedback to evaluate.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.67%. Comparing base (1316f99) to head (e92e2c6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6669   +/-   ##
=======================================
  Coverage   96.67%   96.67%           
=======================================
  Files         308      308           
  Lines       97986    97986           
=======================================
+ Hits        94725    94728    +3     
+ Misses       3261     3258    -3     

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