Fix: update Groq model to llama-3.3-70b-versatile

llama-3.1-70b-versatile decommissioned, replaced by 3.3-70b-versatile.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -42,7 +42,7 @@ def fetch_task_file(task_id: str) -> str:
 
 class BasicAgent:
     def __init__(self):
-        llm = ChatGroq(model="llama-3.1-70b-versatile", temperature=0)
+        llm = ChatGroq(model="llama-3.3-70b-versatile", temperature=0)
         tools = [
             DuckDuckGoSearchRun(),
             WikipediaQueryRun(api_wrapper=WikipediaAPIWrapper(top_k_results=3)),
@@ -50,7 +50,7 @@ class BasicAgent:
             fetch_task_file,
         ]
         self.agent = create_react_agent(llm, tools)
-        print("BasicAgent initialized with LangGraph + Groq (llama-3.1-70b-versatile).")
+        print("BasicAgent initialized with LangGraph + Groq (llama-3.3-70b-versatile).")
 
     def __call__(self, question: str, task_id: str = "") -> str:
         full_question = f"[Task ID: {task_id}]\n\n{question}" if task_id else question
@@ -192,7 +192,7 @@ with gr.Blocks() as demo:
         1. Log in to your Hugging Face account using the button below.
         2. Click 'Run Evaluation & Submit All Answers' to fetch questions, run the agent, and submit.
 
-        **Agent:** LangGraph ReAct agent with Groq (llama-3.1-70b-versatile)
+        **Agent:** LangGraph ReAct agent with Groq (llama-3.3-70b-versatile)
         **Tools:** DuckDuckGo search, Wikipedia, Python REPL, File fetcher
 
         ---