[SAC] [OSGeo] #2896: Upgrade wiki from wikimedia 1.34 to 1.39

[OSGeo]

#2896: Upgrade wiki from wikimedia 1.34 to 1.39
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 Reporter:  robe           |       Owner:  sac@…
     Type:  task           |      Status:  new
 Priority:  normal         |   Milestone:  Sysadmin Contract 2023-I
Component:  Systems Admin  |  Resolution:
 Keywords:                 |
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Comment (by robe):

 After much trial and error of upgrading plugins etc, I hink I finally got
 staging to 1.39.2 wikimedia.  I plan to upgrade production too, after I
 have tested staging a bit

 https://staging.wiki.osgeo.org
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2896#comment:2>
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