chore(deps): update dependency @octokit/rest to v21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@octokit/rest	^20.0.2 -> ^21.0.0

---

Release Notes

octokit/rest.js (@​octokit/rest)

### [`v21.0.0`](https://togithub.com/octokit/rest.js/compare/v20.1.1...12b6c6521dc767a8c127fbbfcc74b0c76d1ab056) [Compare Source](https://togithub.com/octokit/rest.js/compare/v20.1.1...v21.0.0)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - "after 5am and before 5pm every weekday" (UTC).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ 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.