meta: bump step-security/harden-runner from 2.7.1 to 2.8.0

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.7.1 to 2.8.0.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@a4aa98b...f086349)

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

Signed-off-by: dependabot[bot] <support@github.com>
PR-URL: #53245
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: dependabot[bot]