bump utils to 13.0.1

brings in a fix to InvalidEmail/Phone/AddressExceptions not being
instantiated correctly. `exception.message` is not a python standard,
so we shouldn't be relying on it to transmit exception reasons -
rather we should be using `str(exception)` instead. This involved a
handful of small changes to the schema validation

tests/app/invite/test_invite_rest.py

@@ -60,7 +60,7 @@ def test_create_invited_user_invalid_email(client, sample_service, mocker):
     assert response.status_code == 400
     json_resp = json.loads(response.get_data(as_text=True))
     assert json_resp['result'] == 'error'
-    assert json_resp['message'] == {'email_address': ['Not a valid email address.']}
+    assert json_resp['message'] == {'email_address': ['Not a valid email address']}
     assert mocked.call_count == 0