Trivial bracket fix for remote cluster warn message (elastic#136516)

Author: ywangd

server/src/main/java/org/elasticsearch/transport/RemoteClusterService.java

@@ -306,7 +306,7 @@ public void onResponse(RemoteClusterConnectionStatus status) {
 
             @Override
             public void onFailure(Exception e) {
-                logger.warn(() -> "project [" + projectId + " failed to update remote cluster connection [" + clusterAlias + "]", e);
+                logger.warn(() -> "project [" + projectId + "] failed to update remote cluster connection [" + clusterAlias + "]", e);
             }
         }, latch::countDown));