Update supported versions: remove Python 3.7 and add Python 3.12

[msabramo]

as described at https://devguide.python.org/versions/

Fixes: GH-971

There's probably more that needs to be done with GitHub Actions, README.rst, changelog.rst, but this is a start...

[BoboTiG]

You can grep the whole source code with "3.7" & "37" and adapt here and there.

[msabramo]

I seeked and destroyed I think the relevant cases of 3.7 and 37. What's remaining seems okay to keep I guess:

(.venv)
abramowi at Marcs-MacBook-Pro-3 in ~/Code/OpenSource/watchdog (update-supported-versions)
$ ag '3\.7|37'
tests/test_observers_winapi.py
117:        File "C:\Python37-32\lib\threading.py", line 926, in _bootstrap_inner

changelog.rst
11:- Drop support for Python 3.7.
224:- Avoid deprecated ``PyEval_InitThreads`` on Python 3.7+ (`#746 <https://github.com/gorakhargosh/watchdog/pull/746>`__)
343:- [inotify] Fixed the way ``OSError`` are re-raised (`#377 <https://github.com/gorakhargosh/watchdog/issues/377>`__)
375:- [bsd] Improved the platform detection (`#378 <https://github.com/gorakhargosh/watchdog/pull/378>`__)
376:- [inotify] Fixed a crash when the root directory being watched by was deleted (`#374 <https://github.com/gorakhargosh/watchdog/pull/374>`__)
382:- [windows] Fixed the ``FILE_LIST_DIRECTORY`` constant (`#376 <https://github.com/gorakhargosh/watchdog/pull/376>`__)

src/watchdog_fsevents.c
724:// PyEval_InitThreads() does nothing as of Python 3.7 and is deprecated in 3.9.

[BoboTiG]

Maybe also tweak:

• watchdog/.github/workflows/build-and-publish.yml

  Line 56 in 6cfe9cc

  CIBW_SKIP: "cp36-*" # skip 3.6 wheels

• watchdog/.github/workflows/tests.yml

  Line 44 in 6cfe9cc

  - "3.7"

[msabramo]

Haha I was just going to say that I just remembered that ag ignores dotfiles and dot directories by default, so I think I missed the GitHub Actions stuff.

(.venv)
abramowi at Marcs-MacBook-Pro-3 in ~/Code/OpenSource/watchdog (update-supported-versions)
$ ag '3\.7|37' .github/workflows
.github/workflows/tests.yml
44:          - "3.7"

[BoboTiG]

I think you can add 3.12 to the CI + tox. It will fail for a time, but then it will run automagically when tox will support 3.12 (without having us to check for updates on their side).