🐛 Fix small MUAD dataset URL

[sofiia-chorna]

It was noticed that the URL for the small MUAD dataset is no longer available in https://huggingface.co/fira7s/Muad2, I suggest the new address is the account of U2IS: https://huggingface.co/datasets/ENSTA-U2IS/miniMUAD. This change causes issues when attempting to download the dataset using the current implementation

In this PR, I updated the URL and added a small test to verify the accessibility of the small MUAD dataset.

Feel free to modify or expand upon this PR as needed 😊 Perhaps, actual new URL is different

Context

A screenshot of the error is attached below for your reference

[alafage]

Hello @sofiia-chorna!

Thanks for the PR. We forgot to update the path when we changed the dataset's location.
The new URL is correct. I will merge your modifications with the dev branch!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.22%. Comparing base (63e9ece) to head (5e5635b).
Report is 2 commits behind head on dev.

Additional details and impacted files

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##              dev     #127   +/-   ##
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  Coverage   97.22%   97.22%           
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  Files         143      143           
  Lines        7123     7123           
  Branches      908      908           
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  Hits         6925     6925           
  Misses        153      153           
  Partials       45       45           

Flag	Coverage Δ
cpu	97.22% <ø> (ø)
pytest	97.22% <ø> (ø)

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