temp pin setuptools so package can install

[adamgayoso]

upstream pytorch issue

[codecov]

Codecov Report

Merging #1309 (ec74cf8) into master (eb8950e) will increase coverage by 0.01%.
The diff coverage is 98.83%.

@@            Coverage Diff             @@
##           master    #1309      +/-   ##
==========================================
+ Coverage   90.63%   90.64%   +0.01%     
==========================================
  Files          96       97       +1     
  Lines        7782     7796      +14     
==========================================
+ Hits         7053     7067      +14     
  Misses        729      729              

Impacted Files	Coverage Δ
scvi/train/_trainingplans.py	95.68% <97.95%> (-0.30%)	⬇️
scvi/module/_scanvae.py	78.70% <100.00%> (ø)
scvi/module/base/_base_module.py	91.42% <100.00%> (+0.16%)	⬆️
scvi/train/_metrics.py	100.00% <100.00%> (ø)
scvi/train/_trainrunner.py	92.45% <100.00%> (+0.29%)	⬆️

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[adamgayoso]

@meeseeksdev backport to 0.14.x