chore(deps): Bump gRPC to v1.81.0

[vladbologa]

Description

Update gRPC from v1.80.0 → v1.81.0-pre1 and protobuf from v31.1 → v33.5

❗ This is a pre-release gRPC version, and the PR is only for testing. Will update the PR with 1.81.0 when it's released.

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.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.34%. Comparing base (72a187c) to head (6095809).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3368   +/-   ##
=======================================
  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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