Fix bug (missing include)

src/agenda_culturel/views.py

@@ -14,7 +14,7 @@ from .celery import create_event_from_submission
 from .models import Event, Category, StaticContent
 from django.utils import timezone
 from enum import StrEnum
-from datetime import date
+from datetime import date, timedelta
 from django.db.models import Q, F
 
 from django.urls import reverse_lazy