Update Persona

curl --request PUT \
  --url https://api.zo.computer/personas/{persona_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "prompt": "<string>",
  "model": "<string>",
  "image": "<string>"
}
'

{
  "id": "<string>",
  "name": "<string>",
  "prompt": "<string>",
  "model": "<string>",
  "image": "<string>",
  "created_at": "<string>",
  "updated_at": "<string>"
}