Remove the deprecated generators

Author: atoka93

openapi-generator-annotations/lib/src/openapi_generator_annotations_base.dart

@@ -337,17 +337,5 @@ enum Generator {
   ///
   /// You can read more about it here https://github.com/dart-ogurets/dart-openapi-maven
   dioAlt,
-
-  /// This uses the next gen dio generator. This is experimental and use at your own risk. It might be removed or renamed in the future
-  ///
-  /// You can read more about it here https://github.com/OpenAPITools/openapi-generator/pull/8869
-  dioNext,
-
-  /// This generates code based on the jaguar package Source gen is required
-  /// after generating code with this generator
-  /// corresponds to dart-jaguar
-  ///
-  /// An Http Api generator inspired by Retrofit for Dart
-  jaguar,
 }
 enum Wrapper { fvm, flutterw, none }