Upgrade to Nextcloud 11

[dnutan (Marc)]

Unfourtunately not yet from an rpm package.
Seems it will be delayed for a little while:

Nextcloud and php versions

Continuing the discussion from Nextcloud update instructions: As @fasttech just suggested, we should address this issue and start working on NextCloud 11 upgrade. How can we tackle this? Is SCL approach doable? @dev_team