doom icons are broken after doom upgrade

### I confirm that...

- [X] I have searched the [issue tracker](https://github.com/doomemacs/doomemacs/issues), [documentation](https://docs.doomemacs.org), [FAQ](https://docs.doomemacs.org/-/faq), [Discourse](https://discourse.doomemacs.org), and [Google](https://google.com), in case this issue has already been reported/resolved.

- [X] I have read "[How to Debug Issues](https://doomemacs.org/d/how2debug)", and will use it to provide as much information about this issue as possible.

- [X] The issue can be reproduced on the **latest** available commit of Doom.

- [X] The issue can be reproduced on a stable release of Emacs, such as 27, 28, or 29. *(Unstable versions end in .50, .60, or .9x)*

### Expected behavior

When running `doom upgrade`, my icons now appear to be broken on emacs 29.1 and MacOS.

### Current behavior

I've tried three different solutions:

1. Installing nerd-fonts via `M-x nerd-icons-install-fonts`
2. Installing nerd-fonts via the website and setting `(setq nerd-icons-font-names '("SymbolsNerdFontMono-Regular.ttf"))` (from #7431)
3. Moving everything in my `.config/doom` dir and running `doom install` again.

Fonts do seem to be found by `doom`:

**Current behaviour**

### Steps to reproduce

1. Open emacs
2. Observe doom dashboard

### System Information

https://pastebin.com/vsykrwJM