Update setuptools to 57.3.0

[pyup-bot]

This PR updates setuptools from 57.0.0 to 57.3.0.

Changelog

57.3.0

-------


Changes
^^^^^^^
* 2465: Documentation is now published using the Furo theme.

57.2.0

-------


Changes
^^^^^^^
* 2724: Added detection of Windows ARM64 build environments using the ``VSCMD_ARG_TGT_ARCH`` environment variable.

57.1.0

-------


Changes
^^^^^^^
* 2692: Globs are now sorted in 'license_files' restoring reproducibility by eliminating variance from disk order.
* 2714: Update to distutils at pypa/distutilse2627b7.
* 2715: Removed reliance on deprecated ssl.match_hostname by removing the ssl support. Now any index operations rely on the native SSL implementation.

Documentation changes
^^^^^^^^^^^^^^^^^^^^^
* 2604: Revamped the backward/cross tool compatibility section to remove
some confusion.
Add some examples and the version since when ``entry_points`` are
supported in declarative configuration.
Tried to make the reading flow a bit leaner, gather some informations
that were a bit dispersed.

Links

• PyPI: https://pypi.org/project/setuptools
• Changelog: https://pyup.io/changelogs/setuptools/
• Repo: https://github.com/pypa/setuptools

[coveralls]

Coverage remained the same at 86.413% when pulling e64fba1 on pyup-update-setuptools-57.0.0-to-57.3.0 into 2716a32 on master.

[pyup-bot]

Closing this in favor of #337