4.0.0-alpha.0

This release has API incompatibilities with 3.x:

• many functions and methods have been made private
• use of "naive" datetimes is now forbidden (but their use is not diagnosed). Use https://pypi.org/project/flake8-datetimez/ or the ruff equivalent to check your calling code.

What's Changed

• to everything there is a season by @jepler in #92
• Enable a bunch more ruff diagnostics by @jepler in #99
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #100 [& others]
• build docs during CI by @jepler in #101

Full Changelog: 3.0.8...4.0.0-alpha.0