Backport PR #1317 on branch 0.14.x (update black version)

[adamgayoso]

No description provided.

[codecov]

Codecov Report

Merging #1324 (c0f34a0) into 0.14.x (9545fef) will not change coverage.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           0.14.x    #1324   +/-   ##
=======================================
  Coverage   90.57%   90.57%           
=======================================
  Files          95       95           
  Lines        7733     7733           
=======================================
  Hits         7004     7004           
  Misses        729      729           

Impacted Files	Coverage Δ
scvi/distributions/_negative_binomial.py	87.11% <0.00%> (ø)
scvi/model/_metrics.py	47.69% <ø> (ø)
scvi/model/_totalvi.py	83.72% <100.00%> (ø)
scvi/module/_amortizedlda.py	100.00% <100.00%> (ø)
scvi/module/_multivae.py	88.82% <100.00%> (ø)

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[adamgayoso]

docs are failing because of pytorch setuptools issue