Update requirements.txt

requirements.txt

@@ -1,8 +1,7 @@
-docarray==0.32.1
-openai==0.27.8
-streamlit==1.25.0
-streamlit-chat==0.1.1
-langchain==0.0.260
-pypdf==3.12.2
-tiktoken==0.4.0
-pydantic==1.10.11
+openai
+streamlit
+streamlit_chat
+langchain==0.0.305
+pypdf
+langchain[docarray]
+tiktoken