Update type of get_session_auth_fallback_hash to the correct type (typeddjango#2407)

Signed-off-by: saJaeHyukc <[email protected]>

Author: JaeHyuckSa

Diff for: django-stubs/contrib/auth/base_user.pyi

@@ -1,4 +1,4 @@
-from typing import Any, ClassVar, Literal, TypeVar, overload
+from typing import Any, ClassVar, Iterable, Literal, TypeVar, overload
 
 from django.db import models
 from django.db.models.base import Model
@@ -33,7 +33,7 @@ class AbstractBaseUser(models.Model):
     def set_unusable_password(self) -> None: ...
     def has_usable_password(self) -> bool: ...
     def get_session_auth_hash(self) -> str: ...
-    def get_session_auth_fallback_hash(self) -> str: ...
+    def get_session_auth_fallback_hash(self) -> Iterable[str]: ...
     @classmethod
     def get_email_field_name(cls) -> str: ...
     @classmethod