Remove unused library

pubspec.lock

@@ -609,13 +609,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.2.2"
-  in_app_purchase:
-    dependency: "direct main"
-    description:
-      name: in_app_purchase
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.5.2"
   intl:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -44,7 +44,6 @@ dependencies:
   fluttertoast: ^8.1.1
   google_nav_bar: ^5.0.5 #supported
   http: ^0.13.4
-  in_app_purchase: ^0.5.2
   intl: ^0.17.0
   json_annotation: ^4.5.0
   local_auth: ^1.1.5