修复修改用户拓展字段接口报错的问题

core/src/main/java/com/wecloud/im/param/ModifyUserAttributesParam.java

@@ -2,6 +2,8 @@ package com.wecloud.im.param;
 
 import lombok.Data;
 
+import java.util.Map;
+
 import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotNull;
 
@@ -18,5 +20,5 @@ public class ModifyUserAttributesParam {
     private String userId;
 
     @NotNull(message = "attributes 不能为空")
-    private String attributes;
+    private Map<String, Object> attributes;
 }