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": "64b28a21-4b0f-41dc-85d3-cd0a275dc912",
    "type": "retrospective_steps",
    "attributes": {
      "retrospective_process_id": "bb718863-2df1-4cc1-ad8b-fd69cab1804b",
      "title": "Step 2",
      "description": "Step 2 description",
      "incident_role_id": "d2c5779e-8ba3-4e3d-ab27-28acf48a0a70",
      "due_after_days": 7,
      "position": 2,
      "skippable": true,
      "created_at": "2026-01-07T12:01:57.120-08:00",
      "updated_at": "2026-01-07T12:01:58.490-08:00"
    }
  }
}