Retrieves an incident retrospective step

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

{
  "data": {
    "id": "af47fc02-2385-4359-90e7-30295da24a01",
    "type": "incident_retrospective_steps",
    "attributes": {
      "retrospective_step_id": "4aa66852-a960-418d-bc6d-99d89fa538be",
      "incident_id": "08799b36-4f03-4200-ab5d-27142e716646",
      "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": "2025-09-01T09:44:48.193-07:00",
      "updated_at": "2025-09-01T09:44:48.193-07:00"
    }
  }
}