fix(deps): update step-security/harden-runner action to v2.21.0

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This PR contains the following updates:

Package	Type	Update	Change
step-security/harden-runner	action	minor	v2.20.1 → v2.21.0

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Release Notes

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

v2.21.0

Compare Source

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

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