chore(deps): update docker/build-push-action action to v6.19.0 (#4315)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [docker/build-push-action](https://redirect.github.com/docker/build-push-action) | action | minor | `v6.18.0` → `v6.19.0` |

---

### Release Notes

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

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

[Compare Source](https://redirect.github.com/docker/build-push-action/compare/v6.18.0...v6.19.0)

- Scope default git auth token to `github.com` by [@&#8203;crazy-max](https://redirect.github.com/crazy-max) in [#&#8203;1451](https://redirect.github.com/docker/build-push-action/pull/1451)
- Bump brace-expansion from 1.1.11 to 1.1.12 in [#&#8203;1396](https://redirect.github.com/docker/build-push-action/pull/1396)
- Bump form-data from 2.5.1 to 2.5.5 in [#&#8203;1391](https://redirect.github.com/docker/build-push-action/pull/1391)
- Bump js-yaml from 3.14.1 to 3.14.2 in [#&#8203;1429](https://redirect.github.com/docker/build-push-action/pull/1429)
- Bump lodash from 4.17.21 to 4.17.23 in [#&#8203;1446](https://redirect.github.com/docker/build-push-action/pull/1446)
- Bump tmp from 0.2.3 to 0.2.4 in [#&#8203;1398](https://redirect.github.com/docker/build-push-action/pull/1398)
- Bump undici from 5.28.4 to 5.29.0 in [#&#8203;1397](https://redirect.github.com/docker/build-push-action/pull/1397)

**Full Changelog**: <docker/build-push-action@v6.18.0...v6.19.0>

</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

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/ObolNetwork/charon).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0Mi45Ny4wIiwidXBkYXRlZEluVmVyIjoiNDIuOTcuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

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@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+    - uses: docker/build-push-action@ee4ca427a2f43b6a16632044ca514c076267da23 # v6.19.0
       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@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+    - uses: docker/build-push-action@ee4ca427a2f43b6a16632044ca514c076267da23 # v6.19.0
       with:
         context: .
         platforms: linux/amd64,linux/arm64