Fixed #28109 -- Corrected the stack level of unordered queryset pagination warnings.

Refs #26290.

Thanks Tim for the review.

django/core/paginator.py

@@ -100,7 +100,8 @@ class Paginator:
             warnings.warn(
                 'Pagination may yield inconsistent results with an unordered '
                 'object_list: {!r}'.format(self.object_list),
-                UnorderedObjectListWarning
+                UnorderedObjectListWarning,
+                stacklevel=3
             )