[python] update langchain third party package version. (ModelEngine-Group#218)

(cherry picked from commit efd61f0)

Author: surpercodehang

framework/fel/python/requirements.txt

@@ -1,7 +1,8 @@
-pydantic==2.6.3
+pydantic==2.7.4
 psutil==6.1.1
 httpx==0.28.1
 pandas==2.1.3
 llama-index==0.12.46
 langchain-core==0.3.68
-langchain_community==0.3.27
+langchain_community==0.3.27
+langchain-openai==0.3.28