Upgrade protobuf version to remediate a leak.

[tvalentyn]

Fixes: #28246

[tvalentyn]

cc: @damccorm

[codecov]

Codecov Report

Merging #29255 (0b798d7) into master (3934117) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #29255      +/-   ##
==========================================
- Coverage   38.32%   38.28%   -0.04%     
==========================================
  Files         688      689       +1     
  Lines      101879   101986     +107     
==========================================
+ Hits        39043    39046       +3     
- Misses      61257    61361     +104     
  Partials     1579     1579              

Flag	Coverage Δ
python	29.88% <ø> (-0.05%)	⬇️

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Files	Coverage Δ
sdks/python/setup.py	0.00% <ø> (ø)

... and 5 files with indirect coverage changes

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[damccorm]

Run Python_Coverage PreCommit

[damccorm]

LGTM once checks pass

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