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

https://github.com/vigoux/void-packages spectrwm-3.3.0
https://github.com/void-linux/void-packages/pull/17777

spectrwm: update to 3.3.0
Bumps up the version of spectrwm.

A patch file from https://github.com/void-linux/void-packages/pull/17777.patch is attached