remove duplicate lines in pubspec.lock

Author: Creeper19472

src/serious_python/example/flask_example/pubspec.lock

@@ -25,47 +25,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.13.0"
-    version: "2.13.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
-      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
       url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
-    version: "2.1.2"
   characters:
     dependency: transitive
     description:
       name: characters
       sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803
-      sha256: f71061c654a3380576a52b451dd5532377954cf9dbd272a78fc8479606670803
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
-    version: "1.4.0"
   clock:
     dependency: transitive
     description:
       name: clock
       sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
-      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
       url: "https://pub.dev"
     source: hosted
     version: "1.1.2"
-    version: "1.1.2"
   collection:
     dependency: transitive
     description:
       name: collection
       sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
-      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
-    version: "1.19.1"
   crypto:
     dependency: transitive
     description: