Merge pull request #1370 from vector-im/renovate/docker-setup-buildx-action-digest

Update docker/setup-buildx-action digest to 885d146

.github/workflows/publish.yaml

@@ -72,7 +72,7 @@ jobs:
             type=raw,value=latest-ci_${{steps.current-time.outputs.unix_time}},enable={{is_default_branch}}
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6
+        uses: docker/setup-buildx-action@885d1462b80bc1c1c7f0b00334ad271f09369c55
 
       - name: Build and push Docker image
         uses: docker/build-push-action@9311bf5263ae5b36f3ec67aff768790c6e2344ad