update 优化 WebSocketUtils 连接关闭改为警告

ruoyi-common/ruoyi-common-websocket/src/main/java/org/dromara/common/websocket/utils/WebSocketUtils.java

@@ -98,7 +98,7 @@ public class WebSocketUtils {
 
     private static void sendMessage(WebSocketSession session, WebSocketMessage<?> message) {
         if (session == null || !session.isOpen()) {
-            log.error("[send] session会话已经关闭");
+            log.warn("[send] session会话已经关闭");
         } else {
             try {
                 session.sendMessage(message);