Fix in-app-purchase version

sdk/example/testnami/pubspec.yaml

@@ -20,7 +20,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.19.0 <4.0.0'
+  sdk: '>=2.18.2 <4.0.0'
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions
@@ -43,7 +43,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
-  in_app_purchase: ^3.1.11
+  in_app_purchase:
   in_app_purchase_storekit:
   uni_links: ^0.5.1