go.mod,wgengine/magicsock: update wireguard-go (#16148)

Our conn.Bind implementation is updated to make Send() offset-aware for
future VXLAN/Geneve encapsulation support.

Updates tailscale/corp#27502

Signed-off-by: Jordan Whited <jordan@tailscale.com>

wgengine/magicsock/batching_conn.go

@@ -21,5 +21,5 @@ var (
 type batchingConn interface {
 	nettype.PacketConn
 	ReadBatch(msgs []ipv6.Message, flags int) (n int, err error)
-	WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error
+	WriteBatchTo(buffs [][]byte, addr netip.AddrPort, offset int) error
 }