Update docker/setup-buildx-action digest to 2c8bcda

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -51,7 +51,7 @@ jobs:
       # multi-platform images and export cache
       # https://github.com/docker/setup-buildx-action
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435
+        uses: docker/setup-buildx-action@2c8bcdab540207666c188bc0c1fe75d2d109dc81
 
       # Login to GitHub Container Registry (GHCR)
       - name: Log into GitHub Container Registry (GHCR)