chore(deps): update docker/setup-buildx-action digest to 8c0edbc

Author: renovate[bot]

.github/workflows/relay.yaml

@@ -41,7 +41,7 @@ jobs:
           cosign-release: 'v1.4.0'
 
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@20111c644724909db5e5afbf25d7de40ddf74f0b
+        uses: docker/setup-buildx-action@8c0edbc76e98fa90f69d9a2c020dcb50019dc325
 
       - name: Log into registry ${{ env.REGISTRY }}
         if: github.event_name != 'pull_request'