rtl8812au-dkms: update module version to 5.2.20
rtl8812au-dkms: update module version to 5.2.20

Change source repository to https://github.com/gordboy/rtl8812au which
provides newer version of the module.

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages