Update src/zarr/testing/strategies.py

Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>

Author: d-v-b

src/zarr/testing/strategies.py

@@ -405,7 +405,8 @@ def orthogonal_indices(
         newshape[axis] = idxr.size
         npindexer.append(idxr.reshape(newshape))
 
-    return tuple(zindexer), np.broadcast_arrays(*npindexer)
+    # casting the output of broadcast_arrays is needed for numpy < 2
+    return tuple(zindexer), tuple(np.broadcast_arrays(*npindexer))
 
 
 def key_ranges(