fix imports in atexit.pyi

builtins/3/atexit.pyi

@@ -1,5 +1,7 @@
 """Stub file for the 'atexit' module."""
 
+from typing import Any, Callable
+
 def _clear() -> None: ...
 def _ncallbacks() -> int: ...
 def _run_exitfuncs() -> None: ...