[Bug] tun2sock crash on macOS 13 Ventura

Verify steps

[x] Is this something you can debug and fix? Send a pull request! Bug fixes and documentation fixes are welcome.
[X] I have searched on the issue tracker for a related issue.

Version

2.4.1

What OS are you seeing the problem on?

macOS

Description

Just start tun2sock, tried to open web page and got tool crash

CLI or Config

sudo ./tun2socks -device utun123 -proxy socks5://95.111.224.68:59166 -interface en0

Logs

INFO[0000] [DIALER] bind to interface: en0              
INFO[0000] [STACK] tun://utun123 <-> socks5://95.111.224.68:59166 
INFO[0039] [TCP] 198.18.0.1:61085 <-> 52.168.117.170:443 
INFO[0040] [TCP] 198.18.0.1:61087 <-> 17.57.172.11:443  
INFO[0041] [TCP] 192.168.64.5:55176 <-> 17.253.39.207:80 
INFO[0042] [TCP] 192.168.64.5:55177 <-> 142.250.203.195:80 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x103179e44]

goroutine 73 [running]:
github.com/xjasonlyu/tun2socks/v2/proxy.(*Socks5).DialUDP(0x14000113cb0, 0x14000206294)
    github.com/xjasonlyu/tun2socks/v2/proxy/socks5.go:124 +0x3f4
github.com/xjasonlyu/tun2socks/v2/proxy.DialUDP(...)
    github.com/xjasonlyu/tun2socks/v2/proxy/proxy.go:49
github.com/xjasonlyu/tun2socks/v2/tunnel.handleUDPConn({0x1033730d8?, 0x14000212280})
    github.com/xjasonlyu/tun2socks/v2/tunnel/udp.go:40 +0x180
created by github.com/xjasonlyu/tun2socks/v2/tunnel.process
    github.com/xjasonlyu/tun2socks/v2/tunnel/tunnel.go:33 +0x148

How to Reproduce

Just started tun2sock, tried to open web page and got tool crash

xjasonlyu / tun2socks

[Bug] tun2sock crash on macOS 13 Ventura #238