Update to Qwen inference model since current is returning a 400 error

unit2/smolagents/tool_calling_agents.ipynb

@@ -550,9 +550,9 @@
         }
       ],
       "source": [
-        "from smolagents import ToolCallingAgent, WebSearchTool, InferenceClientModel\n",
+        "from smolagents import ToolCallingAgent, DuckDuckGoSearchTool, InferenceClientModel\n",
         "\n",
-        "agent = ToolCallingAgent(tools=[WebSearchTool()], model=InferenceClientModel())\n",
+        "agent = ToolCallingAgent(tools=[DuckDuckGoSearchTool()], model=InferenceClientModel("Qwen/Qwen2.5-72B-Instruct"))\n",
         "\n",
         "agent.run(\"Search for the best music recommendations for a party at the Wayne's mansion.\")"
       ]