feat: Add missing stubs

Add stubs for django.contrib.auth.decorators::login_not_required

django-stubs/contrib/auth/decorators.pyi

@@ -18,6 +18,7 @@ def user_passes_test(
 def login_required(redirect_field_name: str | None = ..., login_url: str | None = ...) -> Callable[[_VIEW], _VIEW]: ...
 @overload
 def login_required(function: _VIEW, redirect_field_name: str | None = ..., login_url: str | None = ...) -> _VIEW: ...
+def login_not_required(view_func: _VIEW) -> _VIEW: ...
 def permission_required(
     perm: Iterable[str] | str, login_url: str | None = ..., raise_exception: bool = ...
 ) -> Callable[[_VIEW], _VIEW]: ...