Fix RTD Build

[ethanwharris]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #887 (aba1eb9) into master (1dcdbbe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #887   +/-   ##
=======================================
  Coverage   89.06%   89.06%           
=======================================
  Files         230      230           
  Lines       12706    12707    +1     
=======================================
+ Hits        11317    11318    +1     
  Misses       1389     1389           

Flag	Coverage Δ
unittests	89.06% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
flash/core/integrations/labelstudio/data_source.py	86.66% <100.00%> (-0.15%)	⬇️
flash/core/model.py	88.18% <100.00%> (+0.02%)	⬆️
flash/core/optimizers/optimizers.py	100.00% <100.00%> (ø)
flash/core/optimizers/schedulers.py	100.00% <100.00%> (ø)
...ash/image/classification/integrations/baal/data.py	40.20% <100.00%> (ø)

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[tchaton]

LGTM !