fix: ipv6 addresses parsing

[perrin4869]

#1803 broke the parsing of ipv6 addresses such as http://[::]:80. Before that PR, using node:url, we would get:

> const { parse } = require("node:url")
undefined
> parse("http://[::]:80")
Url {
  protocol: 'http:',
  slashes: true,
  auth: null,
  host: '[::]:80',
  port: '80',
  hostname: '::',
  hash: null,
  search: null,
  query: null,
  pathname: '/',
  path: '/',
  href: 'http://[::]:80/'
}

With the URL class, however, the hostname becomes:

> new URL("http://[::]:80")
URL {
  href: 'http://[::]/',
  origin: 'http://[::]',
  protocol: 'http:',
  username: '',
  password: '',
  host: '[::]',
  hostname: '[::]',
  port: '',
  pathname: '/',
  search: '',
  searchParams: URLSearchParams {},
  hash: ''
}

This hostname [::] is not compatible with the http.request function. I added some normalization functionality here to return the previous behavior.

Edit: hm... it is a bit hard to add regression tests here, since all the tests seem to run against a single server that doesn't seem to listen on [::]