Update docker/setup-buildx-action action to v2.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
docker/setup-buildx-action	action	minor	v2.8.0 -> v2.9.0

---

Release Notes

docker/setup-buildx-action (docker/setup-buildx-action)

### [`v2.9.0`](https://togithub.com/docker/setup-buildx-action/releases/tag/v2.9.0) [Compare Source](https://togithub.com/docker/setup-buildx-action/compare/v2.8.0...v2.9.0) - Bump [@​docker/actions-toolkit](https://togithub.com/docker/actions-toolkit) from 0.6.0 to 0.7.0 in [https://github.com/docker/setup-buildx-action/pull/246](https://togithub.com/docker/setup-buildx-action/pull/246) - Adds support to cache Buildx binary to hosted tool cache and GHA cache backend **Full Changelog**: https://github.com/docker/setup-buildx-action/compare/v2.8.0...v2.9.0

---

Configuration

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

🚦 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.