How to change OpenApi version?

[DjordyKoert]

I have found another issue where someone also struggled with this problem #1950.

I tried to add the OpenApi attribute to a controller but this resulted in an error.

In OpenApiPhpDescriber.php line 138:
                                                                               
  Using the annotation "OpenApi\Attributes\OpenApi" as a root annotation in "App\Controllers\CustomerController::getCustomers()" is not allowed.  

Where/what is the correct way to do this?

[DjordyKoert]

As shown in #1950 would it not make sense to get the version from the config and pass that to the generator of https://github.com/zircote/swagger-php if available? Otherwise just keep using the default (as it did before).

nelmio_api_doc:
    documentation:
        openapi: 3.1.0
        # the rest of the config

[DjordyKoert]

This could also be fixed by #2149