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

https://github.com/Johnnynator/void-packages rm-mysql
https://github.com/void-linux/void-packages/pull/27559

[wip] Replace mysql with mariadb
#26051

A patch file from https://github.com/void-linux/void-packages/pull/27559.patch is attached