Update draft post

curl --request PUT \
  --url https://api.vidjutsu.ai/v1/posts \
  --header 'Content-Type: application/json' \
  --data '
{
  "caption": "<string>",
  "videoUrl": "<string>",
  "videoId": "<string>",
  "accountId": "<string>",
  "scheduledAt": 123,
  "brief": "<unknown>",
  "tags": [
    {
      "key": "<string>",
      "value": "<string>"
    }
  ]
}
'

{
  "postId": "<string>",
  "updated": true
}