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

https://github.com/HadetTheUndying/void-packages protonvpn-upstreamchange
https://github.com/void-linux/void-packages/pull/22145

protonvpn-cli: change to new upstream
ProtonVPN's upstream address changed, I have updated the template to make packaging it in the future less of a headache for the next release.

A patch file from https://github.com/void-linux/void-packages/pull/22145.patch is attached