chore: Update agent.py

Author: hangfei

contributing/samples/hello_world_anthropic/agent.py

@@ -61,7 +61,7 @@ async def check_prime(nums: list[int]) -> str:
 
 root_agent = Agent(
     model=Claude(model="claude-3-5-sonnet-v2@20241022"),
-    name="data_processing_agent",
+    name="hello_world_agent",
     description=(
         "hello world agent that can roll a dice of 8 sides and check prime"
         " numbers."