chore: update step-security/harden-runner action to v2.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
step-security/harden-runner	action	patch	v2.8.0 -> v2.8.1

---

Release Notes

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

### [`v2.8.1`](https://togithub.com/step-security/harden-runner/releases/tag/v2.8.1) [Compare Source](https://togithub.com/step-security/harden-runner/compare/v2.8.0...v2.8.1) ##### What's Changed - Bug fix: Update isGitHubHosted implementation by [@​varunsh-coder](https://togithub.com/varunsh-coder) in [https://github.com/step-security/harden-runner/pull/425](https://togithub.com/step-security/harden-runner/pull/425) The previous implementation incorrectly identified large GitHub-hosted runners as self-hosted runners. As a result, harden-runner was not executing on these large GitHub-hosted runners. **Full Changelog**: https://github.com/step-security/harden-runner/compare/v2...v2.8.1

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.