[ruby/net-http] Replace Timeout.timeout in Net:HTTP#connect

Use Socket.tcp's connect_timeout option instead

https://github.com/ruby/net-http/commit/753cae3bbc

lib/net/http.rb

@@ -981,14 +981,13 @@ module Net   #:nodoc:
       end
 
       D "opening connection to #{conn_addr}:#{conn_port}..."
-      s = Timeout.timeout(@open_timeout, Net::OpenTimeout) {
       begin
-          TCPSocket.open(conn_addr, conn_port, @local_host, @local_port)
+        s = Socket.tcp conn_addr, conn_port, @local_host, @local_port, connect_timeout: @open_timeout
       rescue => e
+        e = Net::OpenTimeout.new(e) if e.is_a?(Errno::ETIMEDOUT) #for compatibility with previous versions
         raise e, "Failed to open TCP connection to " +
           "#{conn_addr}:#{conn_port} (#{e.message})"
       end
-      }
       s.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
       D "opened"
       if use_ssl?