Retrieves an incident retrospective step

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

{
  "data": {
    "id": "dd02bbf0-51b5-4d0b-a0f6-b13d94b5001c",
    "type": "incident_retrospective_steps",
    "attributes": {
      "retrospective_step_id": "594cfaf7-7c3f-4fc3-bfd5-0fd85d5a37db",
      "incident_id": "1021616d-451c-4fa5-9733-20ddc217a1f1",
      "title": "Step 4",
      "description": null,
      "due_date": null,
      "user_id": null,
      "kind": "custom",
      "position": 1,
      "skippable": false,
      "status": "todo",
      "status_changed_at": null,
      "status_changed_by_id": null,
      "created_at": "2025-07-20T00:40:41.148-07:00",
      "updated_at": "2025-07-20T00:40:41.148-07:00"
    }
  }
}