Retrieves a retrospective step

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

{
  "data": {
    "id": "acbe447c-e7f8-4286-8848-45c2a0f608b0",
    "type": "retrospective_steps",
    "attributes": {
      "retrospective_process_id": "ddfe130f-3580-4e76-b0e6-e5b6c120a258",
      "title": "Step 11",
      "description": "Bar",
      "incident_role_id": "fb5d0eaa-ce9c-42ac-9f81-6657866ac946",
      "due_after_days": null,
      "position": 1,
      "skippable": true,
      "created_at": "2025-09-16T17:17:14.032-07:00",
      "updated_at": "2025-09-16T17:17:14.032-07:00"
    }
  }
}