Updated dependencies (#255)

* Bump android compile and target version, also flutter dependencies and resolve issues

* Remove deprecated splashscreen and added support for new Android 12 version.

* Updated workflow action versions and flutter sdk

* Resolved linting issues

* Resolved test binding issues

lib/helpers.dart

@@ -74,6 +74,6 @@ Future<void> playAudioFile(String path) async {
     return;
   }
 
-  final player = AudioCache();
-  player.play(path);
+  final player = AudioPlayer();
+  player.play(AssetSource(path));
 }