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

https://github.com/ArmedAviator/void-packages keepalived
https://github.com/void-linux/void-packages/pull/25615

keepalived: update to 2.1.5
Tested working.

A patch file from https://github.com/void-linux/void-packages/pull/25615.patch is attached