Bump transformers (#1723)

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examples/pytorch/nlp/huggingface_models/question-answering/mixed_precision/ipex/requirements.txt

@@ -2,6 +2,6 @@ torch
 intel_extension_for_pytorch
 accelerate
 datasets>=1.8.0
-transformers==4.36.0
+transformers==4.38.0
 tensorboard
 tqdm