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

https://github.com/sgn/void-packages tmux-3.1-and-claim-maintainer
https://github.com/void-linux/void-packages/pull/21331

tmux: update to 3.1. And claim maintainer
Change maintainer from Nathan Owens to me.
He/She left for other projects.
And I'm using tmux for every day.

A patch file from https://github.com/void-linux/void-packages/pull/21331.patch is attached