chore(deps): update docker/build-push-action action to v6.19.2 (#4319)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [docker/build-push-action](https://redirect.github.com/docker/build-push-action) | action | patch | `v6.19.0` → `v6.19.2` |

---

### Release Notes

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

### [`v6.19.2`](https://redirect.github.com/docker/build-push-action/compare/v6.19.1...v6.19.2)

[Compare Source](https://redirect.github.com/docker/build-push-action/compare/v6.19.1...v6.19.2)

### [`v6.19.1`](https://redirect.github.com/docker/build-push-action/compare/v6.19.0...v6.19.1)

[Compare Source](https://redirect.github.com/docker/build-push-action/compare/v6.19.0...v6.19.1)

</details>

---

### 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.

---

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

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This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/ObolNetwork/charon).
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Author: renovate[bot]

.github/workflows/build-push-deploy-promrated.yml

@@ -50,7 +50,7 @@ jobs:
         username: obolnetwork
         password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-    - uses: docker/build-push-action@ee4ca427a2f43b6a16632044ca514c076267da23 # v6.19.0
+    - uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6.19.2
       with:
         context: .
         file: ./testutil/promrated/Dockerfile

.github/workflows/build-push-deploy.yml

@@ -69,7 +69,7 @@ jobs:
       if: github.ref_type == 'tag'
       run: echo 'GO_BUILD_FLAG=-ldflags=-X github.com/obolnetwork/charon/app/version.version=${{ github.ref_name }}' >> $GITHUB_ENV
 
-    - uses: docker/build-push-action@ee4ca427a2f43b6a16632044ca514c076267da23 # v6.19.0
+    - uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6.19.2
       with:
         context: .
         platforms: linux/amd64,linux/arm64