`missing-return-type-special-method (ANN204)` with `ignore-fully-untyped = false`

[Avasam]

Summary of changes

Ran ruff check --select=ANN204 --fix --unsafe-fixes with ignore-fully-untyped = true And ran ruff check --select=ANN204 --extend-exclude=*/tests --fix --unsafe-fixes with ignore-fully-untyped = false

Step 6.3 of https://github.com/pypa/setuptools/issues/2345#issuecomment-1627561833 Some slight overlaps with https://github.com/pypa/setuptools/pull/4744

Pull Request Checklist

• [x] Changes have tests (this adds static tests)
• [x] News fragment added in newsfragments/. (not user facing) (See documentation for details)