prepare for 20.0.0-dev.2 release

Author: MaikuB

flutter_local_notifications/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   flutter:
     sdk: flutter
   flutter_local_notifications_linux: ^7.0.0-dev.1
-  flutter_local_notifications_windows: ^2.0.0-dev.1
+  flutter_local_notifications_windows: ^2.0.0-dev.2
   flutter_local_notifications_platform_interface: ^10.0.0-dev.1
   timezone: ^0.10.0