There's a merged pull request on the void-packages repository

Build kde applications with python3
https://github.com/void-linux/void-packages/pull/21036

Description:
Packages build with python 2 and 3 seem to differ only with generated ids in html help, therefore ok to switch.

Left usage of python2 in kig, because it cannot be built with version 3 yet.

@Johnnynator, comments?