[issue46583] Modernize `selectors.py` by removing unused `sys.version_info` check

[Andrew Svetlov]

Change by Andrew Svetlov <andrew.svetlov 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/issue46583>
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