deps(major): update major versions to v4 (major)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
docker/build-push-action	action	major	v3 -> v4
docker/metadata-action	action	major	v3 -> v4

---

Release Notes

docker/build-push-action

### [`v4`](https://togithub.com/docker/build-push-action/compare/v3...v4) [Compare Source](https://togithub.com/docker/build-push-action/compare/v3...v4)

docker/metadata-action

### [`v4`](https://togithub.com/docker/metadata-action/compare/v3...v4) [Compare Source](https://togithub.com/docker/metadata-action/compare/v3...v4)

---

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 these updates 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.