[BUG][kotlin-spring] Wildcard imports in generated Kotlin classes

Created by: volsusdev

Hi @parenko,

what was the reason for introducing wildcard imports to [kotlin-spring] with one of your last commits (https://github.com/OpenAPITools/openapi-generator/commit/cffe2d0259378373500dbc47609c6c4a97d661ca)? We now have the issue that it is not possible anymore to use ktlint for linting the generated code.

openapi-generator version

6.3.0

Related issues/PRs

#14369

Suggest a fix

If there is no problem with single class imports in this case I would create a PR to change this back for javax.validation.constraints imports.