Retrieves a retrospective step

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

{
  "data": {
    "id": "d5497bda-8a14-48b6-bbd5-518c5ffb0dc3",
    "type": "retrospective_steps",
    "attributes": {
      "retrospective_process_id": "991be5fe-2daf-417a-92e8-7711af7cdf88",
      "title": "Step 11",
      "description": "Bar",
      "incident_role_id": "453b43c7-3ef6-4f4a-b69b-56fab99fa327",
      "due_after_days": null,
      "position": 1,
      "skippable": true,
      "created_at": "2025-08-29T15:13:30.703-07:00",
      "updated_at": "2025-08-29T15:13:30.703-07:00"
    }
  }
}