perf: 修改支持 Django4

apps/users/apps.py

@@ -1,7 +1,7 @@
 from __future__ import unicode_literals
 
-from django.utils.translation import ugettext_lazy as _
 from django.apps import AppConfig
+from django.utils.translation import gettext_lazy as _
 
 
 class UsersConfig(AppConfig):
@@ -9,7 +9,4 @@ class UsersConfig(AppConfig):
     verbose_name = _('Users')
 
     def ready(self):
-        from . import signal_handlers
-        from . import notifications
-        from . import tasks
         super().ready()