There is a new pull request by ndowens against master on the void-packages repository

https://github.com/ndowens/void-packages sddm
https://github.com/void-linux/void-packages/pull/27463

sddm: update to 0.19.0.
Installed, stopped sddm and started and sddm launched for me. It is now using pam_tally2. Full changes:
https://github.com/sddm/sddm/releases/tag/v0.19.0

A patch file from https://github.com/void-linux/void-packages/pull/27463.patch is attached