backoffice: make linter happy

src/backoffice/views/schedules.py

@@ -128,7 +128,7 @@ class ScheduleSourceImportDetailView(ScheduleAdminMixin, DetailView):
         if data := ctx['object'].data:
             ctx['activity'] = sorted(
                 data.get('_activity', []),
-                key=lambda item: (action2sort.get(item["action"], 99), type2sort.get(item["type"], 99), item["source_id"]),
+                key=lambda item: (action2sort.get(item['action'], 99), type2sort.get(item['type'], 99), item['source_id']),
             )
         else:
             ctx['activity'] = None