Update schedule rotation user

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

{
  "data": {
    "id": "1b4979bf-0db4-4024-b222-031380685814",
    "type": "schedule_rotation_users",
    "attributes": {
      "schedule_rotation_id": "5d4f3e52-9038-40b8-ae2b-3a56fc6c15b1",
      "user_id": 451,
      "position": 2,
      "created_at": "2025-10-06T09:32:01.625-07:00",
      "updated_at": "2025-10-06T09:32:01.630-07:00"
    }
  }
}