Infer 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. […]

[github-actions]

A PR has been generated to the instance repo:
scverse/cookiecutter-scverse-instance#76

You can check out the PR to preview your changes
in an instance of the cookiecutter template. The PR will be kept in sync with
this PR automatically.

[flying-sheep]

Test failures arewere

 intersphinx inventory 'https://anndata.readthedocs.io/en/stable/objects.inv' not fetchable due to <class 'requests.exceptions.HTTPError'>: 403 Client Error: Forbidden for url: https://anndata.readthedocs.io/en/stable/objects.inv

wtf