Update a FormFieldPosition

curl --request PUT \
  --url https://api.rootly.com/v1/form_field_positions/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '{
  "data": {
    "type": "form_field_positions",
    "attributes": {
      "form_field_id": "<string>",
      "form": "web_new_incident_form",
      "position": 123
    }
  }
}'

{
  "data": {
    "id": "99316074-5d51-4d1f-9185-c46e26a2fd0f",
    "type": "form_field_positions",
    "attributes": {
      "form_field_id": "ca4c0a9f-2704-44b3-bfb7-d9b8f2e66a23",
      "form": "web_update_incident_form",
      "position": 2
    }
  }
}