cherry-pick: 4836-revert-dhcp-upd

Updates #4836.

Squashed commit of the following:

commit 6fe1721d44be1c23e524d477e28b5f7cc5dd2dc6
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Aug 15 17:48:41 2022 +0300

    dhcpd: reverd mod upd

internal/dhcpd/conn_unix.go

@@ -16,16 +16,18 @@ import (
 	"github.com/insomniacslk/dhcp/dhcpv4"
 	"github.com/insomniacslk/dhcp/dhcpv4/server4"
 	"github.com/mdlayher/ethernet"
-	"github.com/mdlayher/packet"
+
+	//lint:ignore SA1019 See the TODO in go.mod.
+	"github.com/mdlayher/raw"
 )
 
 // dhcpUnicastAddr is the combination of MAC and IP addresses for responding to
 // the unconfigured host.
 type dhcpUnicastAddr struct {
-	// packet.Addr is embedded here to make *dhcpUcastAddr a net.Addr without
+	// raw.Addr is embedded here to make *dhcpUcastAddr a net.Addr without
 	// actually implementing all methods.  It also contains the client's
 	// hardware address.
-	packet.Addr
+	raw.Addr
 
 	// yiaddr is an IP address just allocated by server for the host.
 	yiaddr net.IP
@@ -51,13 +53,7 @@ type dhcpConn struct {
 // newDHCPConn creates the special connection for DHCP server.
 func (s *v4Server) newDHCPConn(iface *net.Interface) (c net.PacketConn, err error) {
 	var ucast net.PacketConn
-	ucast, err = packet.Listen(
-		iface,
-		packet.Raw,
-		int(ethernet.EtherTypeIPv4),
-		nil,
-	)
-	if err != nil {
+	if ucast, err = raw.ListenPacket(iface, uint16(ethernet.EtherTypeIPv4), nil); err != nil {
 		return nil, fmt.Errorf("creating raw udp connection: %w", err)
 	}