Assign the platform-specific ``c_intp`` precision via a mypy plugin
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The mypy_ plugin, introduced in `numpy/numpy#17843`_, has again been expanded:
the plugin now is now responsible for setting the platform-specific precision
of `numpy.ctypeslib.c_intp`, the latter being used as data type for various
`numpy.ndarray.ctypes` attributes.

Without the plugin, aforementioned type will default to `ctypes.c_int64`.

To enable the plugin, one must add it to their mypy `configuration file`_:

.. code-block:: ini

    [mypy]
    plugins = numpy.typing.mypy_plugin


.. _mypy: http://mypy-lang.org/
.. _configuration file: https://mypy.readthedocs.io/en/stable/config_file.html
.. _`numpy/numpy#17843`: https://github.com/numpy/numpy/pull/17843

Add a release note for the latest mypy plugin update
REL: Add a release note for the latest mypy plugin update
