Merge pull request #302 from AhmedLSayed9/dependabot/pub/packages/dropdown_button2_test/flutter_lints-4.0.0

Bump flutter_lints from 2.0.3 to 4.0.0 in /packages/dropdown_button2_test

Author: AhmedLSayed9

packages/dropdown_button2_test/pubspec.yaml

@@ -14,7 +14,7 @@ dependencies:
     path: ../dropdown_button2
 
 dev_dependencies:
-  flutter_lints: ^2.0.1
+  flutter_lints: ^4.0.0
   flutter_test:
     sdk: flutter
   file: ^7.0.0