Log Message:
php-nextcloud: Update to 18.0.0

Changelog:
Nextcloud Hub is the first completely integrated on-premises content
collaboration platform on the market, ready for a new generation
of users who expect seamless online collaboration capabilities out
of the box.

With this release, we made a change to what we ship. Nextcloud 17
is now Nextcloud Hub 18. Nextcloud Hub comes with a number of new
apps which get installed by default on installation (but not shipped
as part of the tarball/zip). Nextcloud 17 users can just upgrade
as usual to 18, we encourage you to install the new and improved
apps like Talk, Calendar, Mail, ONLYOFFICE and more. You will get
notified of this recommendation on upgrade!

As this is a major release, the changelog is too long to put here.
Users can look at github milestones to find what has been merged.