Upgrade pip and setuptools (#1918)

[gaborbernat]

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[codecov]

Codecov Report

Merging #1925 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1925   +/-   ##
=======================================
  Coverage   93.98%   93.98%           
=======================================
  Files          86       86           
  Lines        4221     4221           
=======================================
  Hits         3967     3967           
  Misses        254      254           

Flag	Coverage Δ
#tests	93.98% <ø> (ø)

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Impacted Files	Coverage Δ
src/virtualenv/seed/wheels/embed/__init__.py	100.00% <ø> (ø)

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