chore(deps): update step-security/harden-runner action to v2.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
step-security/harden-runner	action	minor	v2.19.4 → v2.20.0

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Release Notes

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

v2.20.0

Compare Source

What's Changed

• Support for block policy for MacOS and Windows GitHub-hosted runners
• Support for Bitrise MacOS GitHub Actions runners
• HTTPS monitoring support for Bun for Linux runners (enterprise tier)

Full Changelog: step-security/harden-runner@v2.19.4...v2.20.0

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