0.22.0 (2023-10-31)

• Class-scoped and module-scoped event loops can be requested
  via the asyncio_event_loop mark. #620
• Deprecate redefinition of the event_loop fixture. #587
  Users requiring a class-scoped or module-scoped asyncio event loop for their tests
  should mark the corresponding class or module with asyncio_event_loop.
• Test items based on asynchronous generators always exit with xfail status and emit a warning during the collection phase. This behavior is consistent with synchronous yield tests. #642
• Remove support for Python 3.7
• Declare support for Python 3.12