fixup

Author: MarcoGorelli

pandas-stubs/core/indexes/base.pyi

@@ -475,7 +475,7 @@ class Index(IndexOpsMixin[S1]):
         ),
     ) -> Self: ...
 
-UnknownIndex: TypeAlias = Index
+UnknownIndex: TypeAlias = Index[Any]
 
 def ensure_index_from_sequences(
     sequences: Sequence[Sequence[Dtype]], names: list[str] = ...