Patsy

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* Removed an inadvertent hard dependency on pytest.

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* Add support for Python 3.13.
* Drop support for Python 2.7 (and remove dependency on the `six` module).
* Fix compatibility with `numpy >= 2`.
* Update development status to 'mature'.

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* Avoid using deprecated `is_categorical_dtype` from `pandas` at all in pandas >=0.25.
* Avoid using deprecated `numpy.row_stack` in favor of `numpy.vstack`.

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* Handle deprecation of `_is_categorical_dtype` in `pandas`.
* Replace `numpy.issubsctype` usage with `numpy.issubdtype` for compatibility with `numpy` 2.0.

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* Add support for Python 3.12, and fix broken unit tests in this version.

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* Officially add support for Python 3.10 and 3.11, and extend test coverage to
include these releases.
* Fix handling of future interpreter features that no longer have a mandatory
release version, as for the `annotations` feature (See `187
<https://github.com/pydata/patsy/pull/187>`__ for details.)