chore(repo): fix analysis

packages/stream_chat_flutter/test/scrollable_positioned_list/horizontal_scrollable_positioned_list_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';

packages/stream_chat_flutter/test/scrollable_positioned_list/reversed_scrollable_positioned_list_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';

packages/stream_chat_flutter/test/scrollable_positioned_list/scrollable_positioned_list_test.dart

@@ -4,11 +4,9 @@
 
 import 'dart:async';
 import 'dart:math';
-import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:stream_chat_flutter/scrollable_positioned_list/scrollable_positioned_list.dart';
 import 'package:stream_chat_flutter/scrollable_positioned_list/src/scroll_view.dart';

packages/stream_chat_flutter/test/scrollable_positioned_list/separated_scrollable_positioned_list_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';

packages/stream_chat_flutter/test/scrollable_positioned_list/seperated_horizontal_scrollable_positioned_list_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';

packages/stream_chat_flutter/test/src/attachment_actions_modal_test.dart

@@ -3,7 +3,6 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
-import 'package:stream_chat_flutter/src/attachment_actions_modal.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 import 'mocks.dart';

packages/stream_chat_flutter/test/src/back_button_test.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
-import 'package:stream_chat_flutter/src/back_button.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 import 'mocks.dart';

packages/stream_chat_flutter/test/src/gradient_avatar_test.dart

@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:golden_toolkit/golden_toolkit.dart';
 import 'package:mocktail/mocktail.dart';
-import 'package:stream_chat_flutter/src/gradient_avatar.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 import 'mocks.dart';

packages/stream_chat_flutter/test/utils/golden.dart

@@ -1,4 +1,3 @@
-import 'dart:async';
 import 'dart:typed_data';
 
 import 'package:flutter/foundation.dart';