Update docker/setup-buildx-action action to v3

.github/workflows/push-container.yml

@@ -30,7 +30,7 @@ jobs:
           path: cloudflare-ddns-docker
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to Github Container Registry
         uses: docker/login-action@v1