Update a category

curl --request PUT \
  --url https://backend.branch.flowengineering.com/project/{projectId}/data-model/{id} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --header 'customer: <customer>' \
  --data '
{
  "addOnly": true,
  "fields": [
    {
      "key": "priority",
      "name": "Priority",
      "tags": [
        {
          "name": "Medium"
        }
      ],
      "type": "tag"
    }
  ]
}
'