Add support for Python 3.12 and drop EOL 3.6 and 3.7

[hugovk]

The second Python 3.12 release candidate is out! 🚀

Call to action

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0.

Python 3.12.0 final is due out in two weeks: 2023-10-02.

See also https://dev.to/hugovk/help-test-python-312-beta-1508/

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Python 3.7 is EOL and no longer receiving security updates (or any updates) from the core Python team.

version	released	eol
3.11	2022-10-24	2027-10-24
3.10	2021-10-04	2026-10-04
3.9	2020-10-05	2025-10-05
3.8	2019-10-14	2024-10-14
3.7	2018-06-26	2023-06-27

https://devguide.python.org/versions/

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.62% 🎉

Comparison is base (140fa51) 80.30% compared to head (0b50226) 80.92%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #449      +/-   ##
===========================================
+ Coverage    80.30%   80.92%   +0.62%     
===========================================
  Files           10       10              
  Lines          782      776       -6     
===========================================
  Hits           628      628              
+ Misses         154      148       -6     

Files Changed	Coverage Δ
argcomplete/_check_console_script.py	0.00% <0.00%> (ø)
argcomplete/_check_module.py	40.98% <0.00%> (ø)

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