Update libsemigroups_pybind11/congruence.py

Co-authored-by: Joe Edwards <80713360+Joseph-Edwards@users.noreply.github.com>

Author: james-d-mitchell

libsemigroups_pybind11/congruence.py

@@ -15,7 +15,7 @@
 from typing import List, Union
 from typing_extensions import Self as _Self
 
-from _libsemigroups_pybind11 import (  # pylint: disable=no-name-in-module,unused-import
+from _libsemigroups_pybind11 import (  # pylint: disable=no-name-in-module
     CongruenceString as _CongruenceString,
     CongruenceWord as _CongruenceWord,
     congruence_non_trivial_classes as _congruence_non_trivial_classes,