chore(deps): update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/docker.yml

@@ -28,7 +28,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true