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

font-iosevka: add slab-serif family
https://github.com/void-linux/void-packages/pull/20106

Description:
The short description of package font-iosevka says "Slender monospace sans-serif and slab-serif typeface", but only the sans-serif family was included. This PR also adds the slab-serif family to the package