main/lua-luaxml: Build from n1tehawk's fork of LuaXML

The original repository for LuaXML is inactive and unmaintained
(and has been since 2013). Switch to a more recently maintained fork,
which contains a number of bug fixes, performance optimizations, and
new features.

It contains a fix for the same bug which was patched in 77f0be51.
8 jobs for !30331 with n1te in 1 minute and 50 seconds (queued for 3 seconds)
latest merge request