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

dispcalGUI: update to 3.9.8, change upstream.
https://github.com/void-linux/void-packages/pull/40420

Description:
dispcalGUI is not maintained by its original authors anymore.

The significant advantage of the fork is python 3 support which excludes python 2 from dependencies (related to #38229).

cc: @lemmi 

#### Testing the changes
- I tested the changes in this PR: **briefly**