Update a retrospective step

curl --request PUT \
  --url https://api.rootly.com/v1/retrospective_steps/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "retrospective_steps",
    "attributes": {
      "title": "<string>",
      "description": "<string>",
      "incident_role_id": "<string>",
      "due_after_days": 123,
      "position": 123,
      "skippable": true
    }
  }
}
'

{
  "data": {
    "id": "c653d580-29a6-4a35-8321-e80ed41672f0",
    "type": "retrospective_steps",
    "attributes": {
      "retrospective_process_id": "3a3267f7-2b67-4c7f-8fd7-6bd829c5e668",
      "title": "Step 2",
      "description": "Step 2 description",
      "incident_role_id": "1e104487-1f99-4372-8412-c3579e89f227",
      "due_after_days": 7,
      "position": 2,
      "skippable": true,
      "created_at": "2026-01-21T11:22:16.262-08:00",
      "updated_at": "2026-01-21T11:22:16.753-08:00"
    }
  }
}