chore(deps): bump docker/build-push-action from 6.14.0 to 6.15.0 (#6588)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.14.0 to 6.15.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](0adf995921...471d1dc4e0)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/container_release4.yml

@@ -47,7 +47,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
       -
         name: Build
-        uses: docker/build-push-action@0adf9959216b96bec444f325f1e493d4aa344497 # v2
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v2
         with:
           context: ./docker
           push: ${{ github.event_name != 'pull_request' }}