Support Python 3.11

[adrienhongcs]

@asyncio.coroutine was removed in Python 3.11.

Using DjangoChannelsGraphqlWs leads to errors such as:

TypeError: Passing coroutines is forbidden, use tasks explicitly.

Are there any plans to upgrade to 3.11?

[Flauschbaellchen]

@prokher May I kindly bump this issue? :bow: Python 3.11 has now been around for 1.5 years and 3.12 is stable, too.