[Dart] Use resources/3_0/petstore.yaml in dart2 generators
Created by: agilob
Simple as that, move dart generators to use more complex schema from openapi 3.0. New files are more complex and expose new bugs in Dart.
Created by: agilob
Simple as that, move dart generators to use more complex schema from openapi 3.0. New files are more complex and expose new bugs in Dart.