API Schema doesn't get update using Postman API

Hello there,
I’m trying to add a default response to each path of the API schema but whenever I tried to update it, it doesn’t get updated, it only shows a 200 response.

but in the console it shows an updated schema.
Screenshot 2021-06-12 at 11.42.48 AM

I did like this.

const apiUpdateSchemaRequest = {
                                            url: postman_schema_url,
                                            method: 'PUT',
                                            header: 'x-api-key:' + postman_api_key,
                                            body: {
                                                mode: 'raw',
                                                raw: JSON.stringify(openapi)

                                        pm.sendRequest(apiUpdateSchemaRequest, function (err, res) {
                                            if (err) {
                                            } else {

I don’t know where I’m making mistake.
Here is my collection link

Anyone Please help me with this.