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

Author: renovate[bot]

.github/workflows/publish.yml

@@ -31,7 +31,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@e600775e527acba2317260cadb64b7e19efd5362
+        uses: docker/setup-buildx-action@c7c4c00f3eef127be487a50899a220e44c6bcc87
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action