Update RetrospectiveProcessGroup Step

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

{
  "data": {
    "id": "44385d33-7a56-40c2-9c8f-cdfcf34cfebb",
    "type": "retrospective_process_group_steps",
    "attributes": {
      "retrospective_process_group_id": "1cb015c2-bd53-4cbf-9024-123683de50a3",
      "retrospective_step_id": "3573f1c5-cf9b-470d-94b1-55fc20e35151",
      "position": 2,
      "updated_at": "2025-07-25T22:40:49.593-07:00",
      "created_at": "2025-07-25T22:40:49.478-07:00"
    }
  }
}