Add __all__ to runpy (#7140)

Author: sobolevn

stdlib/runpy.pyi

@@ -2,6 +2,8 @@ from _typeshed import Self
 from types import ModuleType
 from typing import Any
 
+__all__ = ["run_module", "run_path"]
+
 class _TempModule:
     mod_name: str
     module: ModuleType