RPGItems was still broken after the update, but this isnt because rpgitems was outdated. But because one of its dependencies has changed, This dependency is Nyaacore. For the recent RPGItems the dependency has changed Nyaacore to the Shadowed Version of nyaacore. The old nyaacore is no longer needed for rpgitems.
If you dont believe me, check this out: https://github.com/NyaaCat/RPGItems-reloaded/wiki/Installation
Shadowed Version download found here: https://ci.nyaacat.com/job/NyaaCore/
For the rest of its dependencies, its vault and languageutils. So make sure these are updates as well, cant wait to finally work with this plugin again after months... Thank you!