Modernize `selectors.py` by removing unused `sys.version_info` check

[sobolevn]

BPO	46583
Nosy	@asvetlov, @1st1, @sobolevn
PRs	bpo-46583: remove unused sys.version_info check from selectors #31023

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-02-02.08:35:32.258>
created_at = <Date 2022-01-30.14:38:15.281>
labels = ['type-bug', 'library', '3.11']
title = 'Modernize `selectors.py` by removing unused `sys.version_info` check'
updated_at = <Date 2022-02-02.08:36:54.527>
user = 'https://github.com/sobolevn'

bugs.python.org fields:

activity = <Date 2022-02-02.08:36:54.527>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2022-02-02.08:35:32.258>
closer = 'asvetlov'
components = ['Library (Lib)']
creation = <Date 2022-01-30.14:38:15.281>
creator = 'sobolevn'
dependencies = []
files = []
hgrepos = []
issue_num = 46583
keywords = ['patch']
message_count = 3.0
messages = ['412148', '412342', '412343']
nosy_count = 3.0
nosy_names = ['asvetlov', 'yselivanov', 'sobolevn']
pr_nums = ['31023']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46583'
versions = ['Python 3.11']

[sobolevn]

Right now selectors.py contains this check on module-level:

if sys.version_info >= (3, 5):
   ...

Source: https://github.com/python/cpython/blame/8fb36494501aad5b0c1d34311c9743c60bb9926c/Lib/selectors.py#L53

Learning from other modules, we tend to remove lines like this when some python version reaches EOL. And since 3.4 is not support for a long time now, this condition is always true.

I propose to delete it.

[asvetlov]

New changeset 3483aa6 by Nikita Sobolev in branch 'main':
bpo-46583: remove unused sys.version_info check from selectors (GH-31023)
3483aa6

[asvetlov]

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