Fix cpu serving docker image (#12783)

Author: xiangyuT

Diff for: docker/llm/serving/cpu/docker/Dockerfile

@@ -28,7 +28,7 @@ RUN wget -qO /sbin/tini https://github.com/krallin/tini/releases/download/${TINI
     cd ./vllm && \
     git checkout v0.6.6.post1 && \
     pip install cmake>=3.26 wheel packaging ninja "setuptools-scm>=8" numpy && \
-    pip uninstall intel-extension-for-pytorch && \
+    pip uninstall -y intel-extension-for-pytorch && \
     pip install -v -r requirements-cpu.txt --extra-index-url https://download.pytorch.org/whl/cpu && \
     VLLM_TARGET_DEVICE=cpu python3 setup.py install && \
     pip install ray