Check for the __len__ attribute instead of checking if it isn't Array…

…Like. This should be more general and satisfy python3.9

src/pyethnicity/utils/utils.py

@@ -16,7 +16,7 @@ def _assert_equal_lengths(*inputs: Union[object, ArrayLike]):
     lengths = []
 
     for input in inputs:
-        if not isinstance(input, ArrayLike) or isinstance(input, str):
+        if not hasattr(input, "__len__") or isinstance(input, str):
             input = [input]
 
         lengths.append(len(input))