[issue46358] Modernize `test_asyncio/test_base_events.py`

[Alex Waygood]

Change by Alex Waygood <Alex.Waygood at Gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46358>
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