Setuptools

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* 779 via 781: Fix circular import.

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* 778: Fix MSVC monkeypatching.

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* Introduce the (private) ``monkey`` module to encapsulate
the distutils monkeypatching behavior.

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* Now use Warehouse by default for
``upload``, patching ``distutils.config.PyPIRCCommand`` to
affect default behavior.

Any config in .pypirc should be updated to replace

https://pypi.python.org/pypi/

with

https://upload.pypi.org/legacy/

Similarly, any passwords stored in the keyring should be
updated to use this new value for "system".

The ``upload_docs`` command will continue to use the python.org
site, but the command is now deprecated. Users are urged to use
Read The Docs instead.

* 776: Use EXT_SUFFIX for py_limited_api renaming.

* 774 and 775: Use LegacyVersion from packaging when
detecting numpy versions.

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* Re-release of 26.1.0 with pytest pinned to allow for automated
deployment and thus proper packaging environment variables,
fixing issues with missing executable launchers.

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* 763: ``pkg_resources.get_default_cache`` now defers to the
:pypi:`appdirs` project to
resolve the cache directory. Adds a vendored dependency on
appdirs to pkg_resources.