Proxy-Authorization header not cleared on cross-origin redirect in undici.request

**Summary:**: Undici already cleared Authorization and Cookie headers on cross-origin redirects, but did not clear Proxy-Authorization and x-auth-token headers.

var undici = require('undici');

const {
    statusCode,
    headers,
    trailers,
    body
} = undici.request({
    method: 'GET',
    maxRedirections: 1,
    origin: "http://127.0.0.1/", 
    pathname: "",
    headers: {
        'content-type': 'application/json',
        'Cookie': 'secret …