Bump docker/setup-buildx-action from 3 to 4 (#22)

Author: dependabot[bot]

.github/workflows/container.yml

@@ -34,7 +34,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Log in to the Container registry
         uses: docker/login-action@v3