chore(deps): 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	v2.19.2 → 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

v2.19.3

Compare Source

What's Changed

• Default to audit mode when api-key missing with use-policy-store by @​varunsh-coder in #​665

Full Changelog: step-security/harden-runner@v2.19.2...v2.19.3

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