chore(deps): update docker/setup-buildx-action action to v4

Author: renovate[bot]

.github/workflows/static-site.yml

@@ -32,7 +32,7 @@ jobs:
         uses: docker/setup-qemu-action@v4
 
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Cache Docker layers
         uses: actions/cache@v5