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

https://github.com/motorto/void-packages master
https://github.com/void-linux/void-packages/pull/33749

xmonad: remove package and related package
Removing xmonad as discussed in  #6414, it isn't working properly so there isn't any point of it being on the repos, at least until someonem adopts the package(s)

A patch file from https://github.com/void-linux/void-packages/pull/33749.patch is attached