build: bump docker/build-push-action (#502)

Bumps the github-actions group with 1 update: [docker/build-push-action](https://github.com/docker/build-push-action).
Updates `docker/build-push-action` from 6.11.0 to 6.12.0
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@b32b51a...67a2d40)

Author: dependabot[bot]

.github/workflows/release-step-3.yml

@@ -169,7 +169,7 @@ jobs:
 
       - name: Build and push image
         id: push
-        uses: docker/build-push-action@48aba3b46d1b1fec4febb7c5d0c644b249a11355  # v6.10.0
+        uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d  # v6.12.0
         with:
           context: .
           file: "docker/Dockerfile"