ci: fix rate limiting of setup-protoc in CI

[gruebel]

Changes

• it was already set in other areas

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.4%. Comparing base (91ae096) to head (0566cee).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #2731     +/-   ##
=======================================
- Coverage   79.4%   79.4%   -0.1%     
=======================================
  Files        123     123             
  Lines      22737   22737             
=======================================
- Hits       18060   18059      -1     
- Misses      4677    4678      +1     

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