Update a severity

curl --request PUT \
  --url https://api.rootly.com/v1/severities/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "severities",
    "attributes": {
      "name": "<string>",
      "description": "<string>",
      "severity": "critical",
      "color": "<string>",
      "position": 123,
      "notify_emails": [
        "<string>"
      ],
      "slack_channels": [
        {
          "id": "<string>",
          "name": "<string>"
        }
      ],
      "slack_aliases": [
        {
          "id": "<string>",
          "name": "<string>"
        }
      ]
    }
  }
}
'

{
  "data": {
    "id": "01399664-f742-4de7-ab8a-278977f5f5af",
    "type": "severities",
    "attributes": {
      "name": "P1",
      "slug": "p1",
      "description": "Medium Priority",
      "severity": "medium",
      "color": "#000",
      "position": 2,
      "notify_emails": [],
      "slack_channels": [],
      "slack_aliases": [],
      "created_at": "2026-01-08T15:59:40.543-08:00",
      "updated_at": "2026-01-08T15:59:42.127-08:00"
    }
  }
}