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

https://github.com/Duncaen/void-packages icu-70.1
https://github.com/void-linux/void-packages/pull/35006

icu-70.1, firefox-96.0
[ci skip]

Maybe I could add harfbuzz>=3.0.0, that would pull in the electron packages though, but there are many overlapping ones.

Updated:
* firefox-96.0
* firefox-esr-91.5.0
* thunderbird-91.5.0
* webkit2gtk-2.34.3
* nodejs-16.13.2 (for python3.10)
* php-7.4.27 (to unbreak icu api usage)

A patch file from https://github.com/void-linux/void-packages/pull/35006.patch is attached