Update lib.pyi

Update maybe_indices_to_slice to use np.intp for max_len.

Author: benjamindonnachie

pandas/_libs/lib.pyi

@@ -161,7 +161,7 @@ def maybe_booleans_to_slice(
 ) -> slice | npt.NDArray[np.uint8]: ...
 def maybe_indices_to_slice(
     indices: npt.NDArray[np.intp],
-    max_len: int,
+    max_len: np.intp,
 ) -> slice | npt.NDArray[np.intp]: ...
 def is_all_arraylike(obj: list) -> bool: ...