chore(deps): Update docker/build-push-action action to v6.14.0 (#9320)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[docker/build-push-action](https://github.com/docker/build-push-action)
| action | minor | `v6.13.0` -> `v6.14.0` |

---

### Release Notes

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

###
[`v6.14.0`](https://github.com/docker/build-push-action/releases/tag/v6.14.0)

[Compare
Source](https://github.com/docker/build-push-action/compare/v6.13.0...v6.14.0)

- Bump
[@&#8203;docker/actions-toolkit](https://github.com/docker/actions-toolkit)
from 0.53.0 to 0.55.0 in
[https://github.com/docker/build-push-action/pull/1324](https://github.com/docker/build-push-action/pull/1324)

**Full Changelog**:
docker/build-push-action@v6.13.0...v6.14.0

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "on Wednesday" (UTC), 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/hypermodeinc/dgraph).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4xNzYuMiIsInVwZGF0ZWRJblZlciI6IjM5LjE3Ni4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

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

.github/workflows/cd-dgraph-nightly.yml

@@ -22,7 +22,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6.13.0
+        uses: docker/build-push-action@v6.14.0
         with:
           push: true
           platforms: linux/amd64,linux/arm64