Update incident_sub_status

curl --request PUT \
  --url https://api.rootly.com/v1/incident_sub_statuses/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "incident_sub_statuses",
    "attributes": {
      "sub_status_id": "<string>",
      "assigned_at": "<string>",
      "assigned_by_user_id": 123
    }
  }
}'

{
  "data": {
    "id": "daa73970-aad9-41fd-9567-13e60e20e625",
    "type": "incident_sub_statuses",
    "attributes": {
      "sub_status_id": "59660bb0-05c4-48db-bc4d-3f9348a28149",
      "incident_id": "4c8bb70c-3bad-46f1-bd5b-c175540ef92e",
      "assigned_at": "2025-10-08T04:37:31.000-07:00",
      "assigned_by_user_id": 339
    },
    "relationships": {
      "sub_status": {
        "data": {
          "id": "59660bb0-05c4-48db-bc4d-3f9348a28149",
          "type": "sub_statuses"
        }
      },
      "assigned_by_user": {
        "data": {
          "id": "339",
          "type": "users"
        }
      }
    }
  }
}