py-setuptools: update to 59.3.0.

v59.3.0
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Changes
^^^^^^^
* #2902: Merge with pypa/distutils@85db7a41242.

Misc
^^^^
* #2906: In ensure_local_distutils, re-use DistutilsMetaFinder to load the module. Avoids race conditions when _distutils_system_mod is employed.

(wiz)