Update dynamic_system_prompt.py

Author: seratch

examples/basic/dynamic_system_prompt.py

@@ -1,8 +1,9 @@
 import asyncio
 import random
+from dataclasses import dataclass
 from typing import Literal
+
 from agents import Agent, RunContextWrapper, Runner
-from dataclasses import dataclass
 
 @dataclass
 class CustomContext: