pydantic version>=2.0.0 for llamaindex (intel-analytics#10694)

* pydantic version

* pydantic version

* upgrade version

.github/workflows/llm_unit_tests.yml

@@ -224,6 +224,7 @@ jobs:
         run: |
           pip install llama-index-readers-file llama-index-vector-stores-postgres llama-index-embeddings-huggingface
           pip install transformers==4.31.0
+          pip install "pydantic>=2.0.0"
           bash python/llm/test/run-llm-llamaindex-tests.sh
   llm-unit-test-on-arc:
     needs: [setup-python-version, llm-cpp-build]
@@ -398,4 +399,5 @@ jobs:
             pip install --pre --upgrade ipex-llm[xpu_2.0] --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/cn/
             source /home/arda/intel/oneapi/setvars.sh
           fi
+          pip install "pydantic>=2.0.0"
           bash python/llm/test/run-llm-llamaindex-tests-gpu.sh