[issue47038] Rewrite asyncio.wait_for test to use IsolatedAsyncioTestCase

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


----------
pull_requests: +30039
pull_request: https://github.com/python/cpython/pull/31948

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47038>
_______________________________________