[REQ] Update boundary for http package in dart generator

Is your feature request related to a problem? Please describe.

The dependency section from the pubspec.yaml file of the dart generator is looking like that:

dependencies:
 http: '>=0.13.0 <0.14.0'
 intl: any
 meta: '^1.1.8'

Since May 2023 the version 1.0.0 and higher is available for the http package. But I can't use newer http versions due to the upper boundary specified from the openapi-generator.

Describe the solution you'd like

I'd like to remove the upper boundary so that the newer version of the http package can be used.

dependencies:
 http: '>=0.13.0'
 intl: any
 meta: '^1.1.8'

I have checked the http package version 1.2.1 and it was working without issues on my project.

Describe alternatives you've considered

Possible workaround is e.g. using a dependency-override in the app's pubspec.yaml file or manually modify the pubspec.yaml of the generated project.

Find the Dart generator's pubspec.yaml dependency section and inspect the existing http constraint. Update it to allow the requested newer versions, then verify that a generated Dart project's dependency declaration accepts http 1.x; no specific test file is named in the issue.