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

https://github.com/CameronNemo/void-packages minijail-v13
https://github.com/void-linux/void-packages/pull/18794

minijail: update to 13.
Also switch to official google github mirror

A patch file from https://github.com/void-linux/void-packages/pull/18794.patch is attached