pytest_plugin imports create_app from main

[ruscoder]

https://github.com/Aidbox/aidbox-python-sdk/blob/master/aidbox_python_sdk/pytest_plugin.py#L11

Was it done explicitly or by mistake?

Before the upgrade, it wasn't a problem to run tests on python 3.9 and old aidbox python SDK

[ruscoder]

@ir4y @dmitryashutov ?

[ruscoder]

Workaround for gunicorn and pytest plugin

async def create_gunicorn_app():
    return create_app()

For Gunicorn use create_gunicorn_app