Add step-security/harden-runner

[JamieMagee]

This pull request strengthens the security of all GitHub Actions workflows by adding the "Harden Runner" step, which uses the step-security/harden-runner action to audit outbound network traffic.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.3%. Comparing base (3decf31) to head (f604306).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1533     +/-   ##
=======================================
- Coverage   90.3%   90.3%   -0.1%     
=======================================
  Files        418     418             
  Lines      35299   35299             
  Branches    2188    2188             
=======================================
- Hits       31877   31876      -1     
  Misses      2980    2980             
- Partials     442     443      +1     

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