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

https://github.com/lugubris/void-packages libexpat
https://github.com/void-linux/void-packages/pull/14461

expat: update to 2.2.8, adopt
fixes https://github.com/void-linux/void-packages/issues/14460

A patch file from https://github.com/void-linux/void-packages/pull/14461.patch is attached