There is an updated pull request by classabbyamp against master on the void-packages repository

https://github.com/classabbyamp/void-packages gimp3
https://github.com/void-linux/void-packages/pull/49890

GIMP 3
WIP until at minimum the full GIMP 3 release, expected in about a month: https://gitlab.gnome.org/GNOME/gimp/-/issues/10373

#### Testing the changes
- I tested the changes in this PR: **YES**|**briefly**|**NO**

#### Plugins
- [ ] nufraw - not (yet) compatible
- [x] resynthesizer - compatible on in-dev branch
- [ ] gmic - not (yet) compatible
- [ ] xsane
- [ ] gimp-lqr-plugin - not (yet) compatible)
- [x] libjxl - disable because gimp supports it directly now

A patch file from https://github.com/void-linux/void-packages/pull/49890.patch is attached