`--http3` does not work together with `--ech`

[ameshkov]

--http3 does not work together with --ech

http3 will work but not ech

Originally posted by @likev in https://github.com/ameshkov/gocurl/issues/14#issuecomment-1745202902

Fixing this requires using Cloudflare's fork of quic-go.

[likev]

@nekohasekai have made a tested fork of quic-go that supports ECH. ECH support is extracted from crypto/tls in cloudflare/go.

Source: https://github.com/SagerNet/quic-go/commits/dev

_Originally posted in https://github.com/quic-go/quic-go/issues/3905#issuecomment-1700389609