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

https://github.com/tsung-ju/void-packages sane-airscan
https://github.com/void-linux/void-packages/pull/27448

New package: sane-airscan-0.99.22
SANE backend for driverless scanning
https://github.com/alexpevzner/sane-airscan

A patch file from https://github.com/void-linux/void-packages/pull/27448.patch is attached