Fix failed checks

Author: BowedMars2

src/google/adk/runners.py

@@ -69,13 +69,13 @@
 
 class StopSignal:
 
-  def __init__(self):
+  def __init__(self) -> None:
     self.stopped = False
 
-  def stop(self):
+  def stop(self) -> None:
     self.stopped = True
 
-  def reset(self):
+  def reset(self) -> None:
     self.stopped = False
 
   def is_set(self) -> bool:

tests/unittests/runners/test_cancel_async.py

@@ -8,7 +8,8 @@
 from google.adk.runners import StopSignal
 from google.genai.types import Content
 from google.genai.types import Part
-from typing import Any, AsyncGenerator
+from typing import Any
+from typing import AsyncGenerator
 import pytest