do not patch URI use for zone-identifier ipv6, instead do not use it

It was clarified in
https://github.com/ruby/ipaddr/issues/52#issuecomment-1399289675 that
there is no bug in `uri`, but rather that ipv6 addresses with
zone-identifier aren't supposed to be used in uris.

lib/httpx/extensions.rb

@@ -160,7 +160,6 @@ module HTTPX
   module URIExtensions
     # uri 0.11 backport, ships with ruby 3.1
     refine URI::Generic do
-      public :set_host
 
       def non_ascii_hostname
         @non_ascii_hostname

lib/httpx/io/udp.rb

@@ -6,11 +6,10 @@ module HTTPX
   class UDP
     include Loggable
 
-    def initialize(uri, _, options)
-      ip = IPAddr.new(uri.host)
-      @host = ip.to_s
-      @port = uri.port
-      @io = UDPSocket.new(ip.family)
+    def initialize(ip, port, options)
+      @host = ip
+      @port = port
+      @io = UDPSocket.new(IPAddr.new(ip).family)
       @options = options
     end
 

lib/httpx/pool.rb

@@ -132,9 +132,7 @@ module HTTPX
     def try_clone_connection(connection, family)
       connection.family ||= family
 
-      if connection.family == family
-        return connection
-      end
+      return connection if connection.family == family
 
       new_connection = connection.class.new(connection.type, connection.origin, connection.options)
       new_connection.family = family

lib/httpx/resolver/native.rb

@@ -21,21 +21,7 @@ module HTTPX
         packet_size: 512,
         timeouts: Resolver::RESOLVE_TIMEOUT,
       }
-    end
-
-    # nameservers for ipv6 are misconfigured in certain systems;
-    # this can use an unexpected endless loop
-    # https://gitlab.com/honeyryderchuck/httpx/issues/56
-    DEFAULTS[:nameserver].select! do |nameserver|
-      begin
-        IPAddr.new(nameserver)
-        true
-      rescue IPAddr::InvalidAddressError
-        false
-      end
-    end if DEFAULTS[:nameserver]
-
-    DEFAULTS.freeze
+    end.freeze
 
     DNS_PORT = 53
 
@@ -318,13 +304,8 @@ module HTTPX
 
       ip, port = @nameserver[@ns_index]
       port ||= DNS_PORT
-      uri = URI::Generic.build(scheme: "udp", port: port)
-      # uri.hostname = ip
-      # link-local IPv6 address may have a zone identifier, but URI does not support that yet.
-      uri.set_host(ip)
-      type = IO.registry(uri.scheme)
-      log { "resolver: server: #{uri}..." }
-      @io = type.new(uri, [IPAddr.new(ip)], @options)
+      log { "resolver: server: #{ip}:#{port}..." }
+      @io = UDP.new(ip, port, @options)
     end
 
     def transition(nextstate)