Merge pull request #2263 from element-hq/renovate/docker-setup-buildx-action-digest

Update docker/setup-buildx-action digest to 2b51285

.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@56a16b8f2aa74bcbd3ab9ec13027cd3ac8e3f94f
+        uses: docker/setup-buildx-action@2b51285047da1547ffb1b2203d8be4c0af6b1f20
 
       - name: Build and push Docker image
         uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0