add wireguard icon
### Requirements

- [x] I have searched the [issues](https://github.com/ryanoasis/nerd-fonts/issues) for my request and found nothing related or helpful
- [X] I have checked the [FAQ](https://github.com/ryanoasis/nerd-fonts/wiki/FAQ-and-Troubleshooting) for help
- [X] I have reviewed the [Wiki](https://github.com/ryanoasis/nerd-fonts/wiki) for relevant information

### Problem Description

hi, i recently noticed that the wireguard icon is missing.

### Desired Solution

adding the icon.
if there aren't any licensing problems, i've already prepared a pr.

### Alternatives Considered

_No response_

### Additional Context

i wondered if that was a licensing problem since the wireguard official website states
> All Rights Reserved. "WireGuard" and the "WireGuard" logo are registered [trademarks](https://www.wireguard.com/trademark-policy/) of Jason A. Donenfeld.

but i couldn't find other issues here on the repo, and since i'm not an expert in licensing shenanigans i'm opening this issue to be sure.