[SAC] [OSGeo] #2674: Upgrade nextcloud from 20.0.14 to 21.0.6

[OSGeo]

#2674: Upgrade nextcloud from 20.0.14 to 21.0.6
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2021-II
Component:  Systems Admin  |   Keywords:
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 The 21 version of nextcloud is supposed to have significant speed
 improvements.

 https://nextcloud.com/blog/nextcloud-hub-21-out-with-up-to-10x-better-
 performance-whiteboard-and-more-collaboration-features/

 I plan to upgrade it next week.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2674>
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