Log Message:
py-setuptools: update to 70.3.0.

v70.3.0
=======

Features
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- Support for loading distutils from the standard library is now deprecated, \ 
including use of SETUPTOOLS_USE_DISTUTILS=stdlib and importing distutils before \ 
importing setuptools. (#4137)

Bugfixes
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- Bugfix for building Cython extension on Windows (pypa/distutils#268).