Nextcloud 32 compatibility

[JonathanTreffler]

Groupfolders v20.0.0 includes some nice refactors (proper types 🥳), which we will need to adapt to.
As groupfolders v20 is exclusive for NC 32, we can follow their lead by releasing a organization_folders version compatible with v20 exclusive to NC 32 too (ensuring nobody can update their instance to an incompatible combination).

[JonathanTreffler]

(planned for January)