Update docker/build-push-action action to v6.9.0

Author: renovate[bot]

.github/workflows/release-artifacts.yaml

@@ -35,7 +35,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build a docker image
-        uses: docker/build-push-action@v6.4.0
+        uses: docker/build-push-action@v6.9.0
         with:
           file: Dockerfile
           context: .

.github/workflows/test-docker-build.yaml

@@ -56,7 +56,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build a docker image
-        uses: docker/build-push-action@v6.4.0
+        uses: docker/build-push-action@v6.9.0
         with:
           file: Dockerfile
           context: .