Bump transformers from 4.36.0 to 4.38.0 in /on_device_training/mobile…

…/ios (#187)

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on_device_training/mobile/ios/requirements.txt

@@ -3,7 +3,7 @@ numpy==1.23.5
 onnx==1.14.0
 scipy==1.11.1
 torch==2.0.1
-transformers==4.36.0
+transformers==4.38.0
 librosa==0.10.0.post2
 soundfile==0.12.1
 cerberus