use Black

[Borda]

What does this PR do?

Fixes # (issue)

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests? [not needed for typos/docs]
• Did you verify new and existing tests pass locally with your changes?
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[codecov]

Codecov Report

Merging #634 (5a8192a) into master (8e42d39) will increase coverage by 0.00%.
The diff coverage is 84.45%.

@@           Coverage Diff           @@
##           master     #634   +/-   ##
=======================================
  Coverage   90.62%   90.63%           
=======================================
  Files         173      173           
  Lines        9183     9182    -1     
=======================================
  Hits         8322     8322           
+ Misses        861      860    -1     

Flag	Coverage Δ
gpu	?
pytest	?
unittests	90.63% <84.45%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
flash/__init__.py	89.47% <ø> (ø)
flash/audio/classification/cli.py	100.00% <ø> (ø)
flash/audio/classification/data.py	93.75% <ø> (ø)
flash/audio/speech_recognition/cli.py	100.00% <ø> (ø)
flash/core/classification.py	96.52% <ø> (ø)
flash/core/finetuning.py	88.88% <ø> (ø)
flash/core/schedulers.py	100.00% <ø> (ø)
flash/core/serve/flash_components.py	90.74% <ø> (ø)
flash/core/serve/types/label.py	100.00% <ø> (ø)
flash/core/serve/types/table.py	100.00% <ø> (ø)
... and 102 more

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