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] <support@github.com>

.github/workflows/build-test-image.yml

@@ -21,7 +21,7 @@ jobs:
         run: echo "data=$(cat package-versions.json)" >> $GITHUB_OUTPUT
 
       - id: docker_build
-        uses: docker/build-push-action@v6.8.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: .
           push: false

.github/workflows/publish-release.yml

@@ -63,7 +63,7 @@ jobs:
         run: echo "data=$(cat package-versions.json)" >> $GITHUB_OUTPUT
 
       - id: docker_build
-        uses: docker/build-push-action@v6.8.0
+        uses: docker/build-push-action@v6.9.0
         with:
           context: .
           push: true