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

https://github.com/lonwillett/void-packages rtl8812au-dkms-update
https://github.com/void-linux/void-packages/pull/20488

rtl8812au-dkms: update to 20200318
Update to use new repository for upstream release that works with kernel 5.6

A patch file from https://github.com/void-linux/void-packages/pull/20488.patch is attached