update go version to 1.18

net.go

@@ -3,8 +3,8 @@
 package wireproxy
 
 import (
-	"golang.zx2c4.com/go118/netip"
 	"net"
+	"net/netip"
 )
 
 func TCPAddrFromAddrPort(addr netip.AddrPort) *net.TCPAddr {
@@ -14,11 +14,3 @@ func TCPAddrFromAddrPort(addr netip.AddrPort) *net.TCPAddr {
 		Port: int(addr.Port()),
 	}
 }
-
-func UDPAddrFromAddrPort(addr netip.AddrPort) *net.UDPAddr {
-	return &net.UDPAddr{
-		IP:   addr.Addr().AsSlice(),
-		Zone: addr.Addr().Zone(),
-		Port: int(addr.Port()),
-	}
-}