Fix two_mutual_arrays() return type hint

Author: honno

array_api_tests/hypothesis_helpers.py

@@ -344,7 +344,7 @@ def multiaxis_indices(draw, shapes):
 def two_mutual_arrays(
     dtypes: Sequence[DataType] = dh.all_dtypes,
     two_shapes: SearchStrategy[Tuple[Shape, Shape]] = two_mutually_broadcastable_shapes,
-) -> SearchStrategy:
+) -> Tuple[SearchStrategy, SearchStrategy]:
     mutual_dtypes = shared(mutually_promotable_dtypes(dtypes=dtypes))
     mutual_shapes = shared(two_shapes)
     arrays1 = xps.arrays(