chore: update GitHub Action pins

[nikzen]

Summary

• Update GitHub Actions in workflows to the latest upstream default-branch commit SHAs.
• Keep existing action paths and only replace refs after @.

Verification

• Checked generated diff to include only .github/**/*.yml / .github/**/*.yaml workflow action refs.
• CI on this PR should validate the updated action versions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.42%. Comparing base (1086625) to head (cdcd65e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #45   +/-   ##
=======================================
  Coverage   61.42%   61.42%           
=======================================
  Files           7        7           
  Lines         420      420           
=======================================
  Hits          258      258           
  Misses        162      162           

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