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

https://github.com/pbui/void-packages hplip
https://github.com/void-linux/void-packages/pull/25585

hplip: add patch to fix scanning
This replaces the deprecated isAlive() method with is_alive().  This was
only made evident with the transition to Python 3.9.

A patch file from https://github.com/void-linux/void-packages/pull/25585.patch is attached