Update the version of the generated Dart code

[MoMakkawi]

Content & configuration

Swagger/OpenAPI definition:
swagger.json

Swagger-Editor configuration options:
Generate the client Dart code from the SwaggerEditor

Is your feature request related to a problem?

We are trying to generate the client's Dart code, but the version of the code being generated is somewhat outdated.

Describe the solution you'd like

It is suggested to update the generated client dart code version to the latest version.

Describe alternatives you've considered

We used SwaggerEditor to generate the Dart code and then maintained the resulting code.

[albinpk]

The generated Dart code is not null-safe, making it unusable in modern projects