Update requirements.txt

requirements.txt

@@ -1,12 +1,11 @@
-langchain==0.3.12
-langchain-community==0.3.12
-langchain-core==0.3.26
-langchain-openai==0.2.14
-langgraph==0.2.60
-gradio==5.9.1
-pypdf2==3.0.1
-faiss-cpu==1.9.0
-python-dotenv==1.0.1
-pydantic==2.10.4
-typing-extensions==4.12.2
-openai==1.58.1
+langchain>=0.3.12
+langchain-community>=0.3.12
+langchain-openai>=0.2.14
+langgraph>=0.2.60
+gradio>=5.9.1
+pypdf2>=3.0.1
+faiss-cpu>=1.9.0
+python-dotenv>=1.0.1
+pydantic>=2.10.4
+typing-extensions>=4.12.2
+openai>=1.58.1