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": "51008696-34af-4959-9daf-f1cf010bce19",
    "type": "incident_sub_statuses",
    "attributes": {
      "sub_status_id": "a01d499f-168b-4846-9241-7f37b4dff0f3",
      "incident_id": "4988f18f-3c81-449a-a583-58b61d26a2ad",
      "assigned_at": "2025-10-28T08:41:46.000-07:00",
      "assigned_by_user_id": 346
    },
    "relationships": {
      "sub_status": {
        "data": {
          "id": "a01d499f-168b-4846-9241-7f37b4dff0f3",
          "type": "sub_statuses"
        }
      },
      "assigned_by_user": {
        "data": {
          "id": "346",
          "type": "users"
        }
      }
    }
  }
}