fix lints

packages/speech_to_text_dialog/example/lib/main.dart

@@ -1,6 +1,6 @@
-import 'package:flutter/material.dart';
 import 'dart:async';
 
+import 'package:flutter/material.dart';
 import 'package:speech_to_text_dialog/speech_to_text_dialog.dart';
 
 void main() {
@@ -50,7 +50,7 @@ class _MyAppState extends State<MyApp> {
 
   @override
   void dispose() {
-    _textSubscription?.cancel();
+    unawaited(_textSubscription?.cancel());
     _speechToTextDialog.dispose();
     super.dispose();
   }

packages/speech_to_text_dialog/example/pubspec.yaml

@@ -26,15 +26,11 @@ dependencies:
     # the parent directory to use the current plugin's version.
     path: ../
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.8
-
 dev_dependencies:
-  integration_test:
-    sdk: flutter
   flutter_test:
     sdk: flutter
+  integration_test:
+    sdk: flutter
 
   # The "flutter_lints" package below contains a set of recommended lints to
   # encourage good coding practices. The lint set provided by the package is