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": "fabe8978-a4ba-4c9d-8d98-e32452f0dba4",
    "type": "retrospective_process_group_steps",
    "attributes": {
      "retrospective_process_group_id": "e7eac457-0298-4b39-a72c-4458d9a86155",
      "retrospective_step_id": "e6baaf6a-1f12-4ea8-8b2d-dfcdf7de168c",
      "position": 2,
      "updated_at": "2025-06-19T02:43:10.586-07:00",
      "created_at": "2025-06-19T02:43:10.459-07:00"
    }
  }
}