Pin coverage==6.2 to fix tests

[sir-sigurd]

See nedbat/coveragepy#1310 and
nedbat/coveragepy#1312.

[codecov]

Codecov Report

Merging #2634 (8f1a9db) into master (1f50a2b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2634   +/-   ##
=======================================
  Coverage   41.90%   41.90%           
=======================================
  Files         535      535           
  Lines       24644    24644           
  Branches     3345     3345           
=======================================
  Hits        10326    10326           
  Misses      13550    13550           
  Partials      768      768           

Flag	Coverage Δ
api-python	90.26% <ø> (ø)
catalog	13.40% <ø> (ø)
lambda	87.86% <ø> (ø)

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

Impacted Files	Coverage Δ
api/python/setup.py	0.00% <ø> (ø)

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