[SAC] [OSGeo] #3027: nextcloud upgrade to 26.0.8

[OSGeo]

#3027: nextcloud upgrade to 26.0.8
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 Reporter:  robe                |      Owner:  robe
     Type:  task                |     Status:  new
 Priority:  normal              |  Milestone:  Sysadmin Contract 2023-I
Component:  SysAdmin/Nextcloud  |   Keywords:
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 We are currently running nextcloud 25.0.12

 The 25.0.13 is the EOL one.  So rather than bothering with that, going to
 go to 26, so we are still in supported mode.

 I'm going to briefly test in dev and then make the change in prod,
 hopefully later tonight.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3027>
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