th: add support for /etc/hosts

Helped-by: Tim Perry <1526883+pimterry@users.noreply.github.com>
Helped-by: Jonathan de Jong <jo@jo.wtf>
Committed-by: kouhai <kouhai@treehouse.systems>
Fixes: https://github.com/mastodon/mastodon/issues/9436

app/lib/request.rb

@@ -261,11 +261,7 @@ class Request
         begin
           addresses = [IPAddr.new(host)]
         rescue IPAddr::InvalidAddressError
-          Resolv::DNS.open do |dns|
-            dns.timeouts = 5
-            addresses = dns.getaddresses(host)
-            addresses = addresses.filter { |addr| addr.is_a?(Resolv::IPv6) }.take(2) + addresses.filter { |addr| !addr.is_a?(Resolv::IPv6) }.take(2)
-          end
+          addresses = Resolv::getaddresses(host)
         end
 
         socks = []