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

sddm: update to 0.19.0.
https://github.com/void-linux/void-packages/pull/27463

Description:
Installed, stopped sddm and started and sddm launched for me. Full changes:
https://github.com/sddm/sddm/releases/tag/v0.19.0
@the-maldridge