build(deps): bump docker/build-push-action from 6.8.0 to 6.9.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.8.0 to 6.9.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.8.0...v6.9.0)

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

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

.github/workflows/buildx.yml

@@ -186,7 +186,7 @@ jobs:
         run: echo ${{ steps.buildx.outputs.platforms }}
 
       - name: Docker Buildx (build)
-        uses: docker/build-push-action@v6.8.0
+        uses: docker/build-push-action@v6.9.0
         if: success() && !contains(github.ref, 'master')
         with:
           push: false
@@ -204,7 +204,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Docker Buildx (push)
-        uses: docker/build-push-action@v6.8.0
+        uses: docker/build-push-action@v6.9.0
         if: success() && github.event_name != 'pull_request' && contains(github.ref, 'master')
         with:
           push: true