chore(deps): update docker/build-push-action action to v6.9.0 (#74)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[docker/build-push-action](https://redirect.github.com/docker/build-push-action)
| action | minor | `v6.8.0` -> `v6.9.0` |

---

### Release Notes

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

###
[`v6.9.0`](https://redirect.github.com/docker/build-push-action/releases/tag/v6.9.0)

[Compare
Source](https://redirect.github.com/docker/build-push-action/compare/v6.8.0...v6.9.0)

- Bump
[@&#8203;docker/actions-toolkit](https://redirect.github.com/docker/actions-toolkit)
from 0.38.0 to 0.39.0 in
[https://github.com/docker/build-push-action/pull/1234](https://redirect.github.com/docker/build-push-action/pull/1234)
- Bump path-to-regexp from 6.2.2 to 6.3.0 in
[https://github.com/docker/build-push-action/pull/1232](https://redirect.github.com/docker/build-push-action/pull/1232)

**Full Changelog**:
docker/build-push-action@v6.8.0...v6.9.0

</details>

---

### 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.

---

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

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/naa0yama/devtool-wsl2).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC45Ny4wIiwidXBkYXRlZEluVmVyIjoiMzguOTcuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiZGF0YXNvdXJjZTpnaXRodWItdGFncyIsImRlcFR5cGU6YWN0aW9uIiwibWFuYWdlcjpnaXRodWItYWN0aW9ucyIsInJlbm92YXRlIiwidXBkYXRlLW1pbm9yIiwidmVyc2lvbmluZzpkb2NrZXIiXX0=-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -62,7 +62,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v6.8.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: .
           file: Dockerfile