Add support for Python 3.11

[hugovk]

Python 3.11 was released on 2022-10-24 🚀

Also test Python 3.12-dev.

[akaihola]

You shouldn't directly update CONTRIBUTORS.rst. Instead, modify contributors.yaml and run the script

python release_tools/update_contributors.py generate --token=ghp_<your GitHub API token> -r -c

I'll need to document this and add a comment in generated content (CONTRIBUTORS.rst and inside README.rst).

[hugovk]

Ah, thanks. Yes, CONTRIBUTING.rst says "add your information in CONTRIBUTORS.rst", so good idea to update that, although requiring to create an API token is a bit offputting and might deter some contributors.

I guess contributors can just update contributors.yaml and you can run the script later (or automate it :)

[akaihola]

I wonder if using a development version of Python will lead to frequent test failures.

[hugovk]

Failures are possible but hopefully not frequent. I've rarely seen them when testing dev versions, but I have found a release blocker in CPython itself by doing so :)

This may also help find early issues in Black and isort, and other linters.

It also means Darker can be ready for 3.12 sooner.

If there are failures, and they're not quick to fix, I wouldn't hesitate to comment this out until it's resolved.

I guess as the linters used by Darker do AST things, there's more exposure to syntax changes before the beta feature freeze in May, so one approach could be to wait until then.

[akaihola]

Just a couple of minor comments, almost ready to merge.

[akaihola]

Thanks @hugovk!

[hugovk]

You're welcome, and thank you for Darker!