bpo-23819: Fix asyncio tests on python optimized mode (GH-30195)

Lib/asyncio/base_events.py

Lib/test/test_asyncio/test_base_events.py

Lib/test/test_asyncio/test_proactor_events.py

Lib/test/test_asyncio/test_selector_events.py

...EWS.d/next/Tests/2021-12-19-08-44-32.bpo-23819.9ueiII.rst