Add torchaudio to requirements

toolkit/config_modules.py imports torchaudio but it is not declared,
so a fresh pip install -r requirements.txt produces an environment
that cannot import the toolkit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

requirements_base.txt

@@ -38,5 +38,6 @@ matplotlib==3.10.1
 setuptools>=77.0.3
 av==16.0.1
 torchcodec==0.9.1
+torchaudio
 librosa==0.11.0
 mutagen==1.47.0