Bump step-security/harden-runner from 2.15.1 to 2.16.0 (#5113)

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.15.1 to 2.16.0.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](https://github.com/step-security/harden-runner/compare/58077d3c7e43986b6b15fba718e8ea69e387dfcc...fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.16.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>