[issue37664] Update bundled pip and setuptools

[rdb]

rdb <rddeblois at gmail.com> added the comment:

@steve.dower It will be necessary to update to pip 19.2.3 for Python 3.8.0b4 shortly, as per:
https://github.com/pypa/pip/pull/6874#issuecomment-522220364

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nosy: +rdb

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