Remove unused Dora dependency

Dora currently won't install as it depends on sklearn, but we're not
using it anyway

demucs/pretrained.py

@@ -10,8 +10,6 @@ import logging
 from pathlib import Path
 import typing as tp
 
-#from dora.log import fatal
-
 import logging
 
 from diffq import DiffQuantizer
@@ -177,4 +175,4 @@ def tasnet(pretrained=True, extra=False):
         if extra:
             name = 'tasnet_extra'
         _load_state(name, model)
-    return model
+    return model

requirements.txt

@@ -37,5 +37,4 @@ onnxruntime
 onnx2pytorch
 SoundFile==0.11.0; sys_platform != 'darwin'
 PySoundFile==0.9.0.post1; sys_platform == 'darwin'
-Dora==0.0.3
 numpy==1.23.5