Update requirements.txt

requirements.txt

@@ -1,6 +1,7 @@
-huggingface_hub==0.25.2
 gradio>=4.0.0
-requests>=2.31.0
-beautifulsoup4>=4.12.0
-duckduckgo-search>=3.9.0
-lxml>=4.9.0
+langchain>=0.1.0
+langchain-openai>=0.0.5
+langchain-core>=0.1.0
+langchain-community>=0.0.20
+langgraph>=0.0.40
+langchain-tavily>=0.1.0