There is an updated pull request by Barbaross93 against master on the void-packages repository

https://github.com/Barbaross93/void-packages herbstluftwm
https://github.com/void-linux/void-packages/pull/36186

herbstluftwm: update to 0.9.4
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A patch file from https://github.com/void-linux/void-packages/pull/36186.patch is attached