Update a middleware

curl --request PUT \
  --url https://your-xano-instance.xano.io/api:meta/workspace/{workspace_id}/middleware/{middleware_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: text/x-xanoscript' \
  --data 'middleware foo {
  input {
    int score
  }
  stack {
    var $x1 {
      value = $input.score + 1
    }
  }
  response = $x1
}
'

{
  "id": 1,
  "created_at": "2023-04-19 21:01:32+0000",
  "updated_at": "2023-04-19 21:01:32+0000",
  "name": "Middleware Test",
  "description": "My middleware description",
  "guid": "YE1fwVhQ-enRlc6Sb42Gqru58-0",
  "branch": "v1",
  "tag": [
    "example tag"
  ],
  "xanoscript": {
    "value": "<string>",
    "message": "<string>"
  }
}