ci(gha): remove cmake downgrade and trust google-cloud-cpp-bot

[scotthart]

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[gemini-code-assist]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.38%. Comparing base (c0ab3df) to head (2981219).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16577      +/-   ##
==========================================
- Coverage   92.38%   92.38%   -0.01%     
==========================================
  Files        2266     2266              
  Lines      219636   219636              
==========================================
- Hits       202903   202902       -1     
- Misses      16733    16734       +1     

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