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 3.37%. Comparing base (0b61b59) to head (158602f).

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #99   +/-   ##
=====================================
  Coverage   3.37%   3.37%           
=====================================
  Files        888     888           
  Lines      36943   36943           
=====================================
  Hits        1248    1248           
  Misses     35695   35695           

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