chore(dart_frog_cli): revert bump to Dart 3.9.0

Author: felangel

packages/dart_frog_cli/pubspec.yaml

@@ -12,7 +12,7 @@ screenshots:
     path: assets/logo.png
 
 environment:
-  sdk: ^3.9.0
+  sdk: ^3.5.0
 
 dependencies:
   args: ^2.5.0