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

https://github.com/teh-jazzman/void-packages mypaint
https://github.com/void-linux/void-packages/pull/20439

mypaint: update to 2.0.0


A patch file from https://github.com/void-linux/void-packages/pull/20439.patch is attached