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": "532eee4b-a91e-4f1e-98e4-6b9260593608",
    "type": "incident_sub_statuses",
    "attributes": {
      "sub_status_id": "a0cb894e-4c43-4db6-a94a-b3afc22e5d1a",
      "incident_id": "ebe5455a-afd8-4d33-a9e7-596d504812ce",
      "assigned_at": "2025-09-01T03:41:08.000-07:00",
      "assigned_by_user_id": 313
    },
    "relationships": {
      "sub_status": {
        "data": {
          "id": "a0cb894e-4c43-4db6-a94a-b3afc22e5d1a",
          "type": "sub_statuses"
        }
      },
      "assigned_by_user": {
        "data": {
          "id": "313",
          "type": "users"
        }
      }
    }
  }
}