autofix stuff with ruff

dnscms/events/apps.py

@@ -2,5 +2,5 @@ from django.apps import AppConfig
 
 
 class EventsConfig(AppConfig):
-    default_auto_field = 'django.db.models.BigAutoField'
-    name = 'events'
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "events"

dnscms/events/tests.py

@@ -1,3 +1,2 @@
-from django.test import TestCase
 
 # Create your tests here.