Setuptools

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Misc
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* 3709: Fix condition to patch ``distutils.dist.log`` to only apply when using
``distutils`` from the stdlib.

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No significant changes.

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Documentation changes
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* 3689: Documented that ``distutils.cfg`` might be ignored unless
``SETUPTOOLS_USE_DISTUTILS=stdlib``.

Misc
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* 3678: Improve clib builds reproducibility by sorting sources -- by :user:`danigm`
* 3684: Improved exception/traceback when invalid entry-points are specified.
* 3690: Fixed logging errors: 'underlying buffer has been detached' (issue 1631).
* 3693: Merge pypa/distutils3e9d47e with compatibility fix for distutils.log.Log.
* 3695, 3697, 3698, 3699: Changed minor text details (spelling, spaces ...)
* 3696: Removed unnecessary ``coding: utf-8`` annotations
* 3704: Fixed temporary build directories interference with auto-discovery.

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Changes
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* 3674: Sync with pypa/distutilse0787fa, including pypa/distutils183 updating distutils to use the Python logging framework.

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Misc
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* 3638: Drop a test dependency on the ``mock`` package, always use :external+python:py:mod:`unittest.mock` -- by :user:`hroncok`
* 3659: Fixed REDoS vector in package_index -- by :user:`SCH227`

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Changes
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* 3624: Fixed editable install for multi-module/no-package ``src``-layout projects.
* 3626: Minor refactorings to support distutils using stdlib logging module.

Documentation changes
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* 3419: Updated the example version numbers to be compliant with PEP-440 on the "Specifying Your Project’s Version" page of the user guide.

Misc
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* 3569: Improved information about conflicting entries in the current working directory
and editable install (in documentation and as an informational warning).
* 3576: Updated version of ``validate_pyproject``.