build(deps): bump docker/setup-buildx-action from 3.8.0 to 3.9.0

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v3.8.0...v3.9.0)

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

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

.github/workflows/container-image.yml

@@ -35,7 +35,7 @@ jobs:
     # > setup-buildx action … is not required but recommended using it to be
     # > able to build multi-platform images, export cache, etc.
     # https://web.archive.org/web/20250103122420/https://github.com/marketplace/actions/build-and-push-docker-images
-    - uses: docker/setup-buildx-action@v3.8.0
+    - uses: docker/setup-buildx-action@v3.9.0
     # > By default, this action uses the Git context so you don't need to use
     # > the actions/checkout action to checkout the repository because this
     # > will be done directly by buildkit. [...]