fix import sorter.

Author: cloudwebrtc

.github/workflows/dart.yml

@@ -23,5 +23,9 @@ jobs:
       - uses: subosito/flutter-action@v1
         with:
           channel: 'stable'
-      - run: flutter packages get
-      - run: dart format lib/ test/ --set-exit-if-changed
+      - name: Install project dependencies
+        run: flutter pub get
+      - name: Dart Format Check
+        run: dart format lib/ test/ --set-exit-if-changed
+      - name: Import Sorter Check
+        run: dart run import_sorter:main --no-comments --exit-if-changed

lib/src/sip_ua_helper.dart

@@ -2,11 +2,11 @@ import 'dart:async';
 
 import 'package:flutter_webrtc/flutter_webrtc.dart';
 import 'package:logger/logger.dart';
+
 import 'package:sip_ua/sip_ua.dart';
 import 'package:sip_ua/src/map_helper.dart';
 import 'package:sip_ua/src/transports/socket_interface.dart';
 import 'package:sip_ua/src/transports/tcp_socket.dart';
-
 import 'config.dart';
 import 'constants.dart' as DartSIP_C;
 import 'event_manager/event_manager.dart';