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

gifski: update to 1.6.4.
https://github.com/void-linux/void-packages/pull/35969

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

#### Local build testing
- libc x86_64


#### Reason

Previous version 1.5.1 not only makes me want to drink, it glitches a greenish tint flicker (has to do with transparency from what I found?) which is not a problem in 1.6.4

![sonic_intro_bad](https://user-images.githubusercontent.com/8009811/156788814-a1890be0-ee57-46e9-af33-fedf06944272.gif)

![sonic_intro_good](https://user-images.githubusercontent.com/8009811/156788819-04639e98-1b72-4732-81fe-47cfb56cf458.gif)