`Async::Scheduler#address_resolve` returns IPv4 before IPv6

[wtn]

Async::Scheduler#address_resolve calls Resolv.getaddresses, which breaks the expectation that resolution honors the platform's address-selection policy:

• Stdlib Ruby: Addrinfo.foreach/Socket.tcp fall through to libc getaddrinfo. On dual-stack hosts where the OS prefers IPv6, AAAA records come back first.
• Under Async: The scheduler hook routes through Resolv.getaddresses, and Resolv::DNS#each_address iterates IN::A before IN::AAAA, so A records come back first.

On an IPv6-only host (with no IPv4 egress) against a dual-stack endpoint, the IPv4 connect() hangs:

require "async"
require "net/http"

Async do
  p Net::HTTP.get_response(URI "https://dualstack.example.com/").code
end.wait

The request succeeds without Async.

[wtn]

@hiSandog Thank you, Mr Chen.