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": "c59235ec-598c-4f95-94a2-39ebf9663311",
    "type": "schedule_rotation_users",
    "attributes": {
      "schedule_rotation_id": "19467dab-9e37-4791-8e61-dcfac3fe0fec",
      "user_id": 425,
      "position": 2,
      "created_at": "2025-09-03T02:25:21.629-07:00",
      "updated_at": "2025-09-03T02:25:21.635-07:00"
    }
  }
}