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Does this supersede #16927 ?

Oh, good catch, I missed that these were targeting the same sub-package !
The answer is (mostly) no: the present PR is minimalist but #16927 contains other valuable work from @MridulS for the test sub directory (test_* files have their own set of ignored rules in .ruff.toml, so it can be done separately).
I would recommend merging this one first, as I need to come back to #16927 later anyway.

Hmm. I see this error

      File "./astropy/table/setup_package.py", line 17, in get_extensions
        Extension(
      File "/usr/lib/python3/dist-packages/setuptools/extension.py", line 130, in __init__
        super().__init__(name, sources, *args, **kw)
      File "/usr/lib/python3/dist-packages/setuptools/_distutils/extension.py", line 110, in __init__
        raise AssertionError("'sources' must be a list of strings")
    AssertionError: 'sources' must be a list of strings

but it is from #16939 ?

@neutrinoceros - could you rebase?

@astrofrog done !

Thanks!