chore: update step-security/harden-runner action to v2.19.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
step-security/harden-runner	action	patch	v2.19.3 → v2.19.4

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Release Notes

step-security/harden-runner (step-security/harden-runner)

v2.19.4

Compare Source

What's Changed

• Improvements for HTTPS Monitoring for the Enterprise tier of Harden Runner

Full Changelog: step-security/harden-runner@v2.19.3...v2.19.4

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.35%. Comparing base (4dc511a) to head (3188056).
⚠️ Report is 3 commits behind head on release.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           release    #3272   +/-   ##
========================================
  Coverage    91.35%   91.35%           
========================================
  Files          282      282           
  Lines        10950    10950           
========================================
  Hits         10003    10003           
  Misses         687      687           
  Partials       260      260           

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