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

https://github.com/rtiangha/void-packages slack-desktop
https://github.com/void-linux/void-packages/pull/26507

Update to 4.11.1
Built package and tested working on amd64.

A patch file from https://github.com/void-linux/void-packages/pull/26507.patch is attached