[whatwg/url] IDNA hostnames end up using emdash instead of -- for ACE-encoded labels (#471)

https://url.spec.whatwg.org/commit-snapshots/0ce82da2b6734cdfa55652954ecc9dee9ed9b951/#example-host-psl

The public suffix renders as `xn-kgbechtv` when it should be `xn--kgbechtv`

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https://github.com/whatwg/url/issues/471