Update docker/setup-buildx-action action to v4

Author: renovate[bot]

.github/workflows/main.yaml

@@ -70,7 +70,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Set up Docker BuildX
-        uses: docker/setup-buildx-action@v3.12.0
+        uses: docker/setup-buildx-action@v4.0.0
 
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3.7.0