Bump docker/build-push-action

Bumps the minor-actions-dependencies group with 1 update in the / directory: [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `docker/build-push-action` from 6.5.0 to 6.9.0
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v6.5.0...v6.9.0)

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

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

.github/workflows/update-test-ubuntu-git.yml

@@ -48,7 +48,7 @@ jobs:
 
       # Use `docker/build-push-action` to build (and optionally publish) the image. 
       - name: Build Docker Image (with optional Push)
-        uses: docker/build-push-action@v6.5.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: .
           file: images/test-ubuntu-git.Dockerfile