reorganize imports with ruff

forum/models.py

@@ -22,20 +22,20 @@
 #
 #
 
-from django.db import models
+from datetime import datetime
+from itertools import chain
+
+import pytz
 from django.conf import settings
-from django.utils.translation import gettext_lazy as _
 from django.core.exceptions import ValidationError
+from django.db import models
 from django.urls import reverse
 from django.utils import timezone
 from django.utils.functional import cached_property
+from django.utils.translation import gettext_lazy as _
 
-from datetime import datetime
-from itertools import chain
-import pytz
-
-from core.models import User, Group
 from club.models import Club
+from core.models import Group, User
 
 
 class Forum(models.Model):