Update a Retrospective Template

curl --request PUT \
  --url https://api.rootly.com/v1/post_mortem_templates/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "post_mortem_templates",
    "attributes": {
      "name": "<string>",
      "default": true,
      "content": "<string>",
      "format": "html"
    }
  }
}'

{
  "data": {
    "id": "661fd00b-bf61-4aec-a8a3-a5b11dc15880",
    "type": "post_mortem_templates",
    "attributes": {
      "name": "My Retrospective Template Updated",
      "slug": "sapiente-iste-nisi-atque",
      "format": "markdown",
      "default": false,
      "content": "## Test update template\n\n### Test new line",
      "created_at": "2025-10-28T14:28:59.823-07:00",
      "updated_at": "2025-10-28T14:29:02.743-07:00"
    }
  }
}