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

https://github.com/Johnnynator/void-packages plasma-5.16.5
https://github.com/void-linux/void-packages/pull/14225

Plasma: update to 5.16.5
(fully untested, feel free to merge if someone tests it :D)

A patch file from https://github.com/void-linux/void-packages/pull/14225.patch is attached