Retrieves a schedule rotation user

curl --request GET \
  --url https://api.rootly.com/v1/schedule_rotation_users/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "66a197bc-5ca1-4d12-8cfc-7cb2980c6aa3",
    "type": "schedule_rotation_users",
    "attributes": {
      "schedule_rotation_id": "1ec38446-9fd7-44d9-b128-426caebb9c10",
      "user_id": 521,
      "position": 2,
      "created_at": "2025-12-24T09:28:02.373-08:00",
      "updated_at": "2025-12-24T09:28:02.378-08:00"
    }
  }
}