[Quicktour Audio] Improve && remove ffmpeg dependency
Author: patrickvonplaten
Pull request: yes

# What does this PR do?

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Fixes #16563 

As discussed in #16563 , it's not good if the official quicktour example depends on Quicktour. Let's rather let `datasets` handle the audio loading and resampling here. IMO, it's also important to directly showcase here how to resample the audio.

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