[fix]添加录音通知插件平台限制，解决报错

lib/utils/notification_util.dart

@@ -1,7 +1,7 @@
 import 'package:custom_notification/custom_notification.dart';
 import 'package:electronic_assistant/module/talk/view.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
-import 'package:get/get_utils/src/platform/platform.dart';
+import 'package:get/get.dart';
 
 class NotificationUtil {
   NotificationUtil._();