Update docker/setup-buildx-action digest to 4cc794f

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@4cc794f83e4b7488282e879f4469e86246e52ddd
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action