chore: upgrade GitHub Actions versions

[vinitkumar]

Summary

• upgrade outdated GitHub Actions versions listed in the repository audit
• align workflow action references with their current supported versions

Testing

• not run (workflow-only change)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e4ef502) to head (cfd0a1e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #117   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          147       147           
  Branches        19        19           
=========================================
  Hits           147       147           

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