Fix python 3.11 compatibility
Copy coroutine function removed in Python 3.11 from https://github.com/python/cpython/blob/3.10/Lib/asyncio/coroutines.py (without the _DEBUG part).
Test for python 3.11 added in CI pipeline
Fix #484 (closed)
Copy coroutine function removed in Python 3.11 from https://github.com/python/cpython/blob/3.10/Lib/asyncio/coroutines.py (without the _DEBUG part).
Test for python 3.11 added in CI pipeline
Fix #484 (closed)