fix(analytics): adds flutter sdk to example apps (#1465)

Co-authored-by: Dustin Noyes <[email protected]>

Author: haverchuck

packages/analytics/amplify_analytics_pinpoint_android/example/pubspec.yaml

@@ -6,10 +6,12 @@ description: Test bed for amplify_analytics_pinpoint_android
 publish_to: "none" # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: ">=2.12.0 <3.0.0"
   flutter: ">=2.2.0"
 
 dependencies:
+  flutter:
+    sdk: flutter
   amplify_analytics_pinpoint_android:
     # When depending on this package from a real application you should use:
     #   amplify_analytics_pinpoint: ^x.y.z
@@ -28,4 +30,4 @@ dev_dependencies:
   flutter_lints: ^1.0.0
 
 flutter:
-  uses-material-design: true
+  uses-material-design: true

packages/analytics/amplify_analytics_pinpoint_ios/example/pubspec.yaml

@@ -10,6 +10,8 @@ environment:
   flutter: ">=2.2.0"
 
 dependencies:
+  flutter:
+    sdk: flutter
   amplify_analytics_pinpoint_ios:
     # When depending on this package from a real application you should use:
     #   amplify_analytics_pinpoint: ^x.y.z