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

https://github.com/lonwillett/void-packages rtl8812au-update
https://github.com/void-linux/void-packages/pull/27208

rtl8812au-dkms: update to 20201214
New module version 5.6.4.2; includes fixes for 5.10 kernels.

A patch file from https://github.com/void-linux/void-packages/pull/27208.patch is attached