Fix get_deleted_objects() return type from list[Model] -> list[str] (#1825)

* Updates `admin.ModelAdmin.get_deleted_objects()`
* Updates `admin.utils.get_deleted_objects()`

Author: golgor

django-stubs/contrib/admin/options.pyi

@@ -265,7 +265,7 @@ class ModelAdmin(BaseModelAdmin[_ModelT]):
     def changelist_view(self, request: HttpRequest, extra_context: dict[str, Any] | None = ...) -> HttpResponse: ...
     def get_deleted_objects(
         self, objs: Sequence[_ModelT] | QuerySet[_ModelT], request: HttpRequest
-    ) -> tuple[list[Model], dict[str, int], set[str], list[str]]: ...
+    ) -> tuple[list[str], dict[str, int], set[str], list[str]]: ...
     def delete_view(
         self, request: HttpRequest, object_id: str, extra_context: dict[str, Any] | None = ...
     ) -> HttpResponse: ...

django-stubs/contrib/admin/utils.pyi

@@ -27,7 +27,7 @@ def flatten(fields: Any) -> list[Callable | str]: ...
 def flatten_fieldsets(fieldsets: Any) -> list[Callable | str]: ...
 def get_deleted_objects(
     objs: Sequence[Model | None] | QuerySet[Model], request: HttpRequest, admin_site: AdminSite
-) -> tuple[list[Model], dict[str, int], set[str], list[str]]: ...
+) -> tuple[list[str], dict[str, int], set[str], list[str]]: ...
 
 class NestedObjects(Collector):
     data: dict[type[Model], set[Model] | list[Model]]