Tabulator does not build with NodeJS > 18

[Tyoneb]

Tabulator relies on the now deprecated package node-sass, which supports NodeJS until v18 (due to some binaries that need to be recompiled).

This has no effect on end-users, but it means that it's not possible to run npm install with NodeJS > 18.

node-sass should be replaced by sass using Dart Sass, the official implementation for JS, as per the deprecation message.