Fix isort style issue

src/pretix/base/models/base.py

@@ -50,6 +50,7 @@ class LoggingMixin:
         """
         from pretix.api.models import OAuthAccessToken, OAuthApplication
         from pretix.api.webhooks import notify_webhooks
+
         from ..services.notifications import notify
         from .devices import Device
         from .event import Event

src/pretix/base/models/log.py

@@ -220,6 +220,7 @@ class LogEntry(models.Model):
     @classmethod
     def bulk_postprocess(cls, objects):
         from pretix.api.webhooks import notify_webhooks
+
         from ..services.notifications import notify
 
         to_notify = [o.id for o in objects if o.notification_type]

src/pretix/control/views/subevents.py

@@ -4,7 +4,7 @@ from datetime import datetime, timedelta
 from dateutil.rrule import DAILY, MONTHLY, WEEKLY, YEARLY, rrule, rruleset
 from django.contrib import messages
 from django.core.files import File
-from django.db import transaction, connections
+from django.db import connections, transaction
 from django.db.models import F, IntegerField, OuterRef, Prefetch, Subquery, Sum
 from django.db.models.functions import Coalesce
 from django.forms import inlineformset_factory