There is a new pull request by Calandracas606 against master on the void-packages repository

https://github.com/Calandracas606/void-packages greybird-deps
https://github.com/void-linux/void-packages/pull/50285

greybird-themes: update to 3.23.3, remove gtk-engine-murrine dep, adopt.
removes dependancy on gtk-engine-murrine. I don't see why a bunch of themes need this dependency. It is only needed for gtk2 support, so if users really need gtk2 support, they could just install that it manually. I don't think it makes sense to pull in gtk2 when installing a theme package.

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A patch file from https://github.com/void-linux/void-packages/pull/50285.patch is attached