chore(deps): update docker/setup-buildx-action digest to c7c4c00

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@0f069ddc17b8eb78586b08a7fe335fd54649e2d3
+        uses: docker/setup-buildx-action@c7c4c00f3eef127be487a50899a220e44c6bcc87
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action