Update step-security/harden-runner action to v2.21.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
step-security/harden-runner	action	patch	v2.21.0 → v2.21.1

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Release Notes

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

v2.21.1

Compare Source

What's Changed

• Improved performance of the disable-sudo feature.
• Fixed an issue in the Community tier where new endpoints required by the GitHub Actions runner were not being implicitly allowed in block mode.
• Fixed the Harden-Runner post step failing on Linux distributions that do not have a merged /usr filesystem layout (for example Debian 11), where /usr/bin/echo does not exist. This mainly affected self-hosted runners.
• Documentation updates: clarified which features are in the Community (free) vs Enterprise tier.

Full Changelog: step-security/harden-runner@v2.21.0...v2.21.1

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