+ python3.9 test failed fix

Author: caffeine-addictt

.gitignore

@@ -1,5 +1,5 @@
 # Python stuff
-venv/
+venv*/
 *.pytest_cache
 __pycache__/
 

src/thread/thread.py

@@ -150,7 +150,7 @@ def _handle_exceptions(self) -> None:
       raise e
 
 
-  def global_trace(self, frame, event: str, arg) -> Callable | None:
+  def global_trace(self, frame, event: str, arg) -> Optional[Callable]:
     if event == 'call':
       return self.local_trace