[SAC] [OSGeo] #2868: Upgrade wiki.osgeo.org to MediaWiki 1.39.1

[OSGeo]

#2868: Upgrade wiki.osgeo.org to MediaWiki 1.39.1
---------------------------+--------------------------------------
 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2023-I
Component:  Systems Admin  |   Keywords:
---------------------------+--------------------------------------
 I'll do this first on staging before production.

 After that I will address #2863
-- 
Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2868>
OSGeo <https://osgeo.org/>
OSGeo committee and general foundation issue tracker.