mobile phone need 11 number

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/utils/CheckUtils.java

@@ -104,7 +104,7 @@ public class CheckUtils {
    * @return true if phone regex valid, otherwise return false
    */
   public static boolean checkPhone(String phone) {
-    return StringUtils.isEmpty(phone) || phone.length() <= 11;
+    return StringUtils.isEmpty(phone) || phone.length() == 11;
   }