Update requirements.txt

requirements.txt

@@ -1,13 +1,12 @@
-langchain>=0.2.0
-langchain-community>=0.2.0
-langchain-core>=0.2.0
-langchain-openai>=0.1.8
-langchain-qdrant>=0.1.0
-langchain-huggingface>=0.0.3
+langchain==0.1.20
+langchain-community==0.0.38
+langchain-core==0.1.52
+langchain-openai==0.1.6
+langchain-text-splitters==0.0.1
 qdrant-client
 gradio
 openai
 tiktoken
 sentence-transformers
 huggingface-hub
-pydantic
+pydantic>=2.0