[flutter_plugin_android_lifecycle] bump e2e depenency to 0.2.1 (#2207)

diff --git a/packages/flutter_plugin_android_lifecycle/example/pubspec.yaml b/packages/flutter_plugin_android_lifecycle/example/pubspec.yaml
index c9d36dc..6344df9 100644
--- a/packages/flutter_plugin_android_lifecycle/example/pubspec.yaml
+++ b/packages/flutter_plugin_android_lifecycle/example/pubspec.yaml
@@ -15,7 +15,7 @@
 
   flutter_plugin_android_lifecycle:
     path: ../
-  e2e: "^0.2.0"
+  e2e: "^0.2.1"
 
 flutter:
   uses-material-design: true