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": "66397517-bdbe-4349-a3e7-87c2f6847081",
    "type": "incident_sub_statuses",
    "attributes": {
      "sub_status_id": "1c523c7b-78e7-47b1-8c91-43bd0e799550",
      "incident_id": "a1d0a4fb-fab8-4d0e-9f01-46f84c1b4969",
      "assigned_at": "2025-12-24T09:26:37.000-08:00",
      "assigned_by_user_id": 362
    },
    "relationships": {
      "sub_status": {
        "data": {
          "id": "1c523c7b-78e7-47b1-8c91-43bd0e799550",
          "type": "sub_statuses"
        }
      },
      "assigned_by_user": {
        "data": {
          "id": "362",
          "type": "users"
        }
      }
    }
  }
}