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": "740a60b8-3150-483c-b943-834d311108e0",
    "type": "schedule_rotation_users",
    "attributes": {
      "schedule_rotation_id": "6c7578fe-a93a-477f-8d83-7df8583f65d6",
      "user_id": 425,
      "position": 2,
      "created_at": "2025-09-15T22:45:10.165-07:00",
      "updated_at": "2025-09-15T22:45:10.171-07:00"
    }
  }
}