chore(deps): update docker/setup-buildx-action digest to 39a1a82

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@39a1a82492fd1ad19af19d61b5f748e4cb6cd1af
 
       - name: Log into registry ${{ env.REGISTRY }}
         if: github.event_name != 'pull_request'