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": "2b8fa011-0794-4149-839f-1a4228de0ca1",
    "type": "incident_sub_statuses",
    "attributes": {
      "sub_status_id": "6b40f9f8-a46d-4f0b-9d92-7173af6fcd5f",
      "incident_id": "37207c6e-9a0e-4196-b803-59c591456bb4",
      "assigned_at": "2025-07-21T23:20:00.000-07:00",
      "assigned_by_user_id": 297
    },
    "relationships": {
      "sub_status": {
        "data": {
          "id": "6b40f9f8-a46d-4f0b-9d92-7173af6fcd5f",
          "type": "sub_statuses"
        }
      },
      "assigned_by_user": {
        "data": {
          "id": "297",
          "type": "users"
        }
      }
    }
  }
}