Update prompt

curl --request PUT \
  --url https://app.langwatch.ai/api/prompts/{id} \
  --header 'Content-Type: application/json' \
  --header 'X-Auth-Token: <api-key>' \
  --data '{
  "name": "<string>"
}'

{
  "id": "<string>",
  "name": "<string>",
  "updatedAt": "<string>"
}