[FIX] auth_sms: correct import of unittest.mock - patch

Author: NL66278

auth_sms/tests/test_auth_sms.py

@@ -1,6 +1,6 @@
 # Copyright 2019 Therp BV <https://therp.nl>
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
-from mock import patch
+from unittest.mock import patch
 
 from .common import Common