downgrade torch for ZeroGPU setup

requirements.txt

@@ -4,6 +4,6 @@ kenlm>=0.3.0
 protobuf>=6.31.1
 pyctcdecode>=0.5.0
 soundfile>=0.13.1
-torch>=2.7.1
-torchaudio>=2.7.1
+torch==2.2.0
+torchaudio==2.2.0
 transformers>=4.52.4