Update docker/setup-buildx-action digest to 774224a

Author: renovate[bot]

.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@18ce135bb5112fa8ce4ed6c17ab05699d7f3a5e0
+        uses: docker/setup-buildx-action@774224adf69ca8de2e87f0afc9ef26b0e4dc8072
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action