[fix] Fixed 0060_cleanup_api_task_notification_types (missing dep)

This migration lacked an explicit dependency on the notifications
module's migrations, which could cause it to run before the
NotificationSetting model is available, resulting in a crash.

Author: nemesifier

openwisp_controller/config/migrations/0060_cleanup_api_task_notification_types.py

@@ -7,8 +7,11 @@ def cleanup_api_task_notification_types(apps, schema_editor):
     if not apps.is_installed("openwisp_notifications"):
         return
     Notification = apps.get_model("openwisp_notifications", "Notification")
+    import ipdb
+
+    ipdb.set_trace()
     NotificationSetting = apps.get_model(
-        "openwisp_notifications", "NotificationSetting"
+        "openwisp_notifications", "NotificationSetting", require_ready=True
     )
     NotificationSetting.objects.filter(
         type__in=["api_task_error", "api_task_recovery"]
@@ -22,6 +25,10 @@ class Migration(migrations.Migration):
 
     dependencies = [
         ("config", "0059_zerotier_templates_ow_zt_to_global"),
+        (
+            "openwisp_notifications",
+            "0009_alter_notificationsetting_organization_and_more",
+        ),
     ]
 
     operations = [