Remove sd2 sound extensions from supported audio extensions

[krshrimali]

What does this PR do?

CI is failing, because SoundFile (for sd2 extension) doesn't accept fsspec objects. Following raises an error:

with fsspec.open(file_path) as _file:
    sound_file = SoundFile(_file)

Error raised:

RuntimeError: Error opening <fsspec.implementations.local.LocalFileOpener object at 0x100f4ac50>: Format not recognised

From discussion, we have decided to remove sd2 extension from supported audio extensions.

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[codecov]

Codecov Report

Merging #1409 (733777a) into master (2657315) will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1409      +/-   ##
==========================================
+ Coverage   91.79%   92.13%   +0.34%     
==========================================
  Files         286      286              
  Lines       12861    12861              
==========================================
+ Hits        11806    11850      +44     
+ Misses       1055     1011      -44     

Flag	Coverage Δ
unittests	92.13% <ø> (+0.34%)	⬆️

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

Impacted Files	Coverage Δ
flash/audio/classification/data.py	100.00% <ø> (+50.00%)	⬆️
flash/audio/speech_recognition/data.py	100.00% <ø> (+20.00%)	⬆️
flash/core/data/utilities/loading.py	98.52% <ø> (+23.52%)	⬆️
flash/graph/classification/input.py	45.45% <0.00%> (-54.55%)	⬇️
flash/graph/classification/cli.py	38.46% <0.00%> (-53.85%)	⬇️
flash/graph/collate.py	50.00% <0.00%> (-50.00%)	⬇️
flash/graph/classification/model.py	42.62% <0.00%> (-49.19%)	⬇️
flash/graph/embedding/model.py	54.83% <0.00%> (-45.17%)	⬇️
flash/graph/backbones.py	64.28% <0.00%> (-35.72%)	⬇️
flash/graph/classification/input_transform.py	66.66% <0.00%> (-33.34%)	⬇️
... and 15 more

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[ethanwharris]

Seems like the error is only for '.sd2' files. Should we not just drop that format from support?

[krshrimali]

Seems like the error is only for '.sd2' files. Should we not just drop that format from support?

Yeah, let's do that. I agree 💯 I don't see any audio dataset having sd2 file extensions as well. Is it okay if I do this in this PR?