Fix: Update ChatGroq import to use correct path

app.py

@@ -6,7 +6,7 @@ import tempfile
 import pandas as pd
 import sqlite3
 from langchain_core.prompts import ChatPromptTemplate
-from langchain_community.chat_models import ChatGroq
+from langchain_community.llms import Groq
 import plotly.express as px
 import time
 import plotly.io as pio
@@ -31,7 +31,7 @@ from backend.main import DocumentAssistant
 document_assistant = DocumentAssistant()
 
 # Initialize the LLM using the llama3-8b-8192 model from Groq
-llm = ChatGroq(
+llm = Groq(
     model="llama3-8b-8192",
     temperature=0,
     max_tokens=None,