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

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

The change should NOT be backported, it doesn't fix any bug but clears code a little

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versions:  -Python 3.10, Python 3.9

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<https://bugs.python.org/issue46583>
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