Update step-security/harden-runner action to v2.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
step-security/harden-runner	action	minor	v2.20.0 → v2.21.0

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Release Notes

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

v2.21.0

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What's Changed

• Support for denied endpoints in block mode. This is included in the enterprise tier. Customers can deny outbound calls, for example, to public package registries.
• Improved Support for AWS CodeBuild GitHub Actions Runners.
• Bug fixes.

Full Changelog: step-security/harden-runner@v2.20.1...v2.21.0

v2.20.1

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What's Changed

• AWS CodeBuild-hosted runner support
• Implicitly allow single-labeled (internal) domains in block-mode

Full Changelog: step-security/harden-runner@v2.20.0...v2.20.1

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Configuration

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