(scheme +chez) :lang option fails on fresh installation

### 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

To install doom emacs, add the (scheme +chez) option to the :lang section, run doom sync, and then run doom doctor without error.

### Current behavior

I created a fresh installation of doom emacs and then added (scheme +chez) to the lang section of my ~/.doom.d/init.el file. I then got the following message from doom doctor:


I believe it's related to the following commit made 3 weeks ago:

https://github.com/doomemacs/doomemacs/commit/87f6f7ab91089235a66d9076fa50a5fc4d37dfea

because checking out https://github.com/doomemacs/doomemacs/commit/f4e02a2d390ff411c05521c179732267b6543439, the commit directly before https://github.com/doomemacs/doomemacs/commit/87f6f7ab91089235a66d9076fa50a5fc4d37dfea, installs (scheme +chez) without issue.

### Steps to reproduce

1. Install Doom Emacs
2. Add (scheme +chez) to lang section of ~/.doom.d/init.el
3. doom sync
4. doom doctor

### System Information

https://pastebin.com/0Kxs5hfw