Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/docker.yml

@@ -43,7 +43,7 @@ jobs:
 
       - name: Build and push
         id: docker_build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true