chore(deps): Bump gRPC to v1.81.0 (#3368)

[vladbologa]

Description

Back-port of of #3368 into the release-3.25 branch.

Checklist

• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added unit tests
• Added integration tests
• Added regression tests

If any of these don't apply, please comment below.

Testing Performed

CI is sufficient.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch vb/release-3.25-grpc-1.81.0

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.34%. Comparing base (c6289a0) to head (01b4a07).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-3.25    #3434   +/-   ##
=============================================
  Coverage         27.34%   27.34%           
=============================================
  Files                95       95           
  Lines              5420     5420           
  Branches           2545     2545           
=============================================
  Hits               1482     1482           
  Misses             3211     3211           
  Partials            727      727           

Flag	Coverage Δ
collector-unit-tests	27.34% <ø> (ø)

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