Update docker/setup-buildx-action digest to e468171

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@edfb0fe6204400c56fbfd3feba3fe9ad1adfa345
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action