Bump pip to 20.2.4

[gaborbernat]

👍

[codecov]

Codecov Report

Merging #1996 into main will decrease coverage by 6.76%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1996      +/-   ##
==========================================
- Coverage   94.12%   87.35%   -6.77%     
==========================================
  Files          86       86              
  Lines        4269     4269              
==========================================
- Hits         4018     3729     -289     
- Misses        251      540     +289     

Flag	Coverage Δ
#tests	87.35% <ø> (-6.77%)	⬇️

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Impacted Files	Coverage Δ
src/virtualenv/seed/wheels/embed/__init__.py	100.00% <ø> (ø)
src/virtualenv/util/subprocess/_win_subprocess.py	0.00% <0.00%> (-95.32%)	⬇️
src/virtualenv/util/path/_pathlib/via_os_path.py	0.00% <0.00%> (-91.51%)	⬇️
...nv/create/via_global_ref/builtin/cpython/mac_os.py	24.30% <0.00%> (-59.67%)	⬇️
src/virtualenv/util/subprocess/__init__.py	88.88% <0.00%> (-11.12%)	⬇️
...nv/create/via_global_ref/builtin/cpython/common.py	93.02% <0.00%> (-6.98%)	⬇️
src/virtualenv/util/path/_sync.py	86.20% <0.00%> (-6.90%)	⬇️
...ualenv/create/via_global_ref/builtin/pypy/pypy2.py	92.20% <0.00%> (-6.50%)	⬇️
...ualenv/create/via_global_ref/builtin/pypy/pypy3.py	94.87% <0.00%> (-5.13%)	⬇️
src/virtualenv/info.py	95.00% <0.00%> (-5.00%)	⬇️
... and 4 more

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