[issue38488] Update bundled pip to 19.3

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 678ffc42813c9fcf36324ba378632b8a3fc18fb6 by Miss Islington (bot) in branch '3.7':
bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491) (GH-20900)
https://github.com/python/cpython/commit/678ffc42813c9fcf36324ba378632b8a3fc18fb6


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