fix 身份证号不能超过20个字符

examcloud-task-service/src/main/java/cn/com/qmth/examcloud/task/service/job/ExamStudentImportParsingFileTask.java

@@ -323,8 +323,8 @@ public class ExamStudentImportParsingFileTask extends AbstractTask {
         } else if (identityNumber.length() < 6) {
             sb.append("  身份证号至少为6个字符");
             hasError = true;
-        } else if (identityNumber.length() > 30) {
-            sb.append("  身份证号不能超过30个字符");
+        } else if (identityNumber.length() > 20) {
+            sb.append("  身份证号不能超过20个字符");
             hasError = true;
         }