Fix pkg_resources.require() (#4818)

Author: Dreamsorcerer

third_party/3/pkg_resources/__init__.pyi

@@ -37,7 +37,7 @@ class WorkingSet:
 
 working_set: WorkingSet
 
-def require(*requirements: Union[str, Sequence[str]]) -> Sequence[Distribution]: ...
+def require(*requirements: _NestedStr) -> Sequence[Distribution]: ...
 def run_script(requires: str, script_name: str) -> None: ...
 def iter_entry_points(group: str, name: Optional[str] = ...) -> Generator[EntryPoint, None, None]: ...
 def add_activation_listener(callback: Callable[[Distribution], None]) -> None: ...