pre-commit: Add pyproject-fmt

[cclauss]

The issue

Ensure that this repos pyproject.toml file is formatted like others.

Also:

• pre-commit autoupdate
• Upgrade to actions/checkout@v4
• Lint on the current version of Python
• Tests on Python 3.12 are failing on Linux, macOS, and Windows.
  • https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#allow-pre-releases

The fix

Add pyproject-fmt to our pre-commit processing.

• https://pyproject-fmt.readthedocs.io

The checklist

• Associated issue
• A news fragment in the news/ directory to describe this fix with the extension .bugfix.rst, .feature.rst, .behavior.rst, .doc.rst. .vendor.rst. or .trivial.rst (this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.