[SAC] [OSGeo] #2901: Upgrade weblate to 4.16.4

[OSGeo]

#2901: Upgrade weblate to 4.16.4
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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):

 Looks like we are using GITHUB_USERNAME / TOKEN and GITEA_USERNAME/TOKEN
 instead of recommended CREDENTIALS, so will need to change this before we
 can upgrade.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2901#comment:1>
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