add beautifulsoup4 to dependency

3p-integrations/langchain/langgraph_rag_agent_local.ipynb

@@ -15,7 +15,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "! pip install -U langchain-huggingface langchain_community langchain-ollama tiktoken langchainhub chromadb langchain langgraph tavily-python sentence-transformers"
+    "! pip install -U langchain-huggingface langchain_community langchain-ollama tiktoken langchainhub chromadb langchain langgraph tavily-python sentence-transformers beautifulsoup4"
    ]
   },
   {