[issue38488] Update bundled pip to 19.3

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

commit feb0846c3a28b05b4cfbc6ab34c764957f3eff55
Author: Xavier Fernandez <xav.fernandez at gmail.com>
Date:   Wed May 27 12:49:34 2020 +0200

    Upgrade bundled versions of pip & setuptools (#16782)

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<https://bugs.python.org/issue38488>
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