[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):

 sorry I had meant to keep the libavatar for 1.35, but it prevented the map
 from loading so had to get rid of it and replace with gravatar.  I'll
 ticket in a separate issue.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2896#comment:7>
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