To avoid errors caused by a Transformers version that is too new. (#13291)

docker/llm/serving/xpu/docker/Dockerfile

@@ -125,6 +125,7 @@ RUN set -eux && \
     python3 get-pip.py && rm get-pip.py && \
     pip install --upgrade requests argparse urllib3 && \
     pip install --pre --upgrade 'ipex-llm[xpu_2.6]>=2.3.0b0,<2.3.0rc1' --extra-index-url https://download.pytorch.org/whl/xpu && \
+    pip install transformers==4.53.2 && \
     pip install transformers_stream_generator einops tiktoken librosa && \
     pip install --upgrade colorama && \
     #