Fix build and librosa numpy dependency errors

[evezers]

Updated librosa function signatures (added missing positional arguments according to librosa/librosa#1521), so librosa and numpy dependency can be flawlessly updated. Also fixed scikit issues according to #1068.

Updating librosa fixes #473, fixes #620, fixes #1016.
Removing Dora fixes #765, fixes #1046, fixes #522, fixes #725, fixes #919.

I also suggest installing into Python virtual environment instead of breaking Arch system Python, so installed as follows:

cd /path/to/UVR
python -m venv venv
source venv/bin/activate
pip install -r requirements.txt
python UVR.py

Tested on Manjaro 23.1.4 and Python 3.11.