[SAC] [OSGeo] #2685: Upgrade weblate to latest stable 4.9.1 from 4.8.1

[OSGeo]

#2685: Upgrade weblate to latest stable 4.9.1 from 4.8.1
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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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 Weblate version we are running is 4.8.1.  There were some changes made to
 better handle things like github token changes and numerous other
 enhancements in 4.9 release detailed here:


 https://docs.weblate.org/en/latest/changes.html

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2685>
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