Update docker/build-push-action action to v5.1.0 (#21)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[docker/build-push-action](https://togithub.com/docker/build-push-action)
| action | minor | `v5.0.0` -> `v5.1.0` |

---

### Release Notes

<details>
<summary>docker/build-push-action (docker/build-push-action)</summary>

###
[`v5.1.0`](https://togithub.com/docker/build-push-action/releases/tag/v5.1.0)

[Compare
Source](https://togithub.com/docker/build-push-action/compare/v5.0.0...v5.1.0)

- Add `annotations` input by
[@&#8203;crazy-max](https://togithub.com/crazy-max) in
[https://github.com/docker/build-push-action/pull/992](https://togithub.com/docker/build-push-action/pull/992)
- Add `secret-envs` input by
[@&#8203;elias-lundgren](https://togithub.com/elias-lundgren) in
[https://github.com/docker/build-push-action/pull/980](https://togithub.com/docker/build-push-action/pull/980)
- Bump [@&#8203;babel/traverse](https://togithub.com/babel/traverse)
from 7.17.3 to 7.23.2 in
[https://github.com/docker/build-push-action/pull/991](https://togithub.com/docker/build-push-action/pull/991)
- Bump
[@&#8203;docker/actions-toolkit](https://togithub.com/docker/actions-toolkit)
from 0.13.0-rc.1 to 0.14.0 in
[https://github.com/docker/build-push-action/pull/990](https://togithub.com/docker/build-push-action/pull/990)
[https://github.com/docker/build-push-action/pull/1006](https://togithub.com/docker/build-push-action/pull/1006)

**Full Changelog**:
docker/build-push-action@v5.0.0...v5.1.0

</details>

---

### Configuration

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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
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---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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.github/workflows/docker.yml

@@ -42,7 +42,7 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Build and push to Docker Hub
-        uses: docker/build-push-action@v5.0.0
+        uses: docker/build-push-action@v5.1.0
         with:
           context: .
           file: ./code-server/Dockerfile