updated api key parameter for litellm

app.py

@@ -39,7 +39,7 @@ def get_current_time_in_timezone(timezone: str) -> str:
 final_answer = FinalAnswerTool()
 
 model = LiteLLMModel(
-    token = os.environ["HF_TOKEN"],
+    api_key = os.environ["HF_TOKEN"],
     max_tokens=2096,
     temperature=0.5,
     model_id= os.environ['MODEL'],# it is possible that this model may be overloaded