Use derived target version

[flying-sheep]

It’s derived from requires-python in both Ruff:

target-version

[…]
If omitted, and Ruff is configured via a pyproject.toml file, the target version will be inferred from its project.requires-python field (e.g., requires-python = ">=3.8").

and Black (in psf/black#3219):

-t, --target-version

[…] By default, Black will try to infer this from the project metadata in pyproject.toml. […]

[ofek]

I didn't know, thanks a lot!

[flying-sheep]

I recently slimmed down my pyproject.toml and found out!

The fewer lines the better.

prettier derives from .editorconfig. Maybe in the future black and Ruff do that too for their line length and we can fully centralize formatting config.