Bump docker/build-push-action from 7.2.0 to 7.3.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 7.2.0 to 7.3.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@f9f3042...53b7df9)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 7.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-containers.yml

@@ -34,7 +34,7 @@ jobs:
           username: flowforge
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}
       - name: Build and push FlowForge Application container
-        uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7.2.0
+        uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7.3.0
         with:
           context: docker-compose/flowforge-docker
           file: docker-compose/flowforge-docker/Dockerfile