Revert "[REMOVE] Unused imports"

This reverts commit f497c18e5b.

allianceauth/authentication/tests/__init__.py

@@ -1,3 +1,9 @@
+from django.db.models.signals import (
+    m2m_changed,
+    post_save,
+    pre_delete,
+    pre_save
+)
 from django.urls import reverse
 from unittest import mock