[fix][sec] Upgrade Python protobuf version to 6.33.5 to address CVE-2026-0994

[lhotari]

Motivation

• Pulsar Functions Python support uses protobuf version 6.31.1 which includes vulnerability CVE-2026-0994

Modifications

• Upgrade Python protobuf version to 6.33.5

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.61%. Comparing base (24eba10) to head (5db360c).

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #25250       +/-   ##
=============================================
+ Coverage     37.65%   72.61%   +34.95%     
- Complexity    13351    34025    +20674     
=============================================
  Files          1902     1959       +57     
  Lines        151237   155401     +4164     
  Branches      17238    17724      +486     
=============================================
+ Hits          56954   112840    +55886     
+ Misses        86577    33560    -53017     
- Partials       7706     9001     +1295     

Flag	Coverage Δ
inttests	25.78% <ø> (-0.10%)	⬇️
systests	22.42% <ø> (-0.02%)	⬇️
unittests	73.59% <ø> (+39.24%)	⬆️

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see 1417 files with indirect coverage changes

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