There is an updated pull request by Duncaen against master on the void-packages repository

https://github.com/Duncaen/void-packages icu-69.1
https://github.com/void-linux/void-packages/pull/32441

icu-69.1, firefox-91.0, firefox-esr-78.13.0, qt5-webengine-5.15.5
[ci skip]

A patch file from https://github.com/void-linux/void-packages/pull/32441.patch is attached