v0.2.9

[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.1.0 → v0.1.8](https://github.com/astral-sh/ruff-pre-commit/compare/v0.1.0...v0.1.8)
- [github.com/psf/black: 23.9.1 → 23.12.0](https://github.com/psf/black/compare/23.9.1...23.12.0)
- [github.com/keewis/blackdoc: v0.3.8 → v0.3.9](https://github.com/keewis/blackdoc/compare/v0.3.8...v0.3.9)