Bump docker/setup-buildx-action from 2.5.0 to 2.9.1

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2.5.0 to 2.9.1.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@4b4e9c3...4c0219f)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/sfss.yml

@@ -32,7 +32,7 @@ jobs:
 
     # Workaround: https://github.com/docker/build-push-action/issues/461
     - name: Setup Docker buildx
-      uses: docker/setup-buildx-action@4b4e9c3e2d4531116a6f8ba8e71fc6e2cb6e6c8c
+      uses: docker/setup-buildx-action@4c0219f9ac95b02789c1075625400b2acbff50b1
 
     - name: Start containers
       run: docker-compose up -d