release 20.6.0

[gaborbernat]

URL of RTD document: https://virtualenv.readthedocs.io/en/release-20.6.0/

[codecov]

Codecov Report

Merging #2147 (75f0202) into main (c52fe3e) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2147      +/-   ##
==========================================
+ Coverage   93.54%   93.57%   +0.02%     
==========================================
  Files          88       88              
  Lines        4371     4371              
==========================================
+ Hits         4089     4090       +1     
+ Misses        282      281       -1     

Flag	Coverage Δ
tests	93.57% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/virtualenv/seed/embed/base_embed.py	98.11% <0.00%> (+1.88%)	⬆️

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