Update docker/setup-buildx-action digest to 4fd8129

Author: renovate[bot]

Diff for: .github/workflows/docker-publish.yml

@@ -48,7 +48,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@ab17e3ec80f3c97b179d7c93beff117fca4f43a8
+        uses: docker/setup-buildx-action@4fd812986e6c8c2a69e18311145f9371337f27d4
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action