Update requirements.txt

Author: alexsu52

tests/post_training/requirements.txt

@@ -10,7 +10,7 @@ pytest-forked
 librosa==0.10.0
 memory-profiler==0.61.0
 optimum-intel==1.20.0
-optimum==1.17.1
+optimum==1.23.1
 scikit-learn>=1.2.2,<=1.5.0
 soundfile==0.12.1
 tensorboard==2.13.0