feat: try IPv6 when dialing IPv4 loopback #49
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If we fail to dial
127.0.0.1:xover TCP when forwarding traffic, try::1as well.This doesn't apply to UDP connections, which don't have "connections" and we therefore can't detect failures (unless we retried every single packet, which I think is a bad idea). The majority of users are only using TCP anyways so I think it's OK.
Relates to coder/coder#12906