Update flox/aggregations.py

Co-authored-by: Illviljan <[email protected]>

Author: dcherian

flox/aggregations.py

@@ -590,8 +590,8 @@ class Scan:
 class AlignedArrays:
     """Simple Xarray DataArray type data class with two aligned arrays."""
 
-    array: np.array
-    group_idx: np.array
+    array: np.ndarray
+    group_idx: np.ndarray
 
     def __post_init__(self):
         assert self.array.shape[-1] == self.group_idx.size