[SAC] [OSGeo] #2872: Upgrade gitea to 1.18.0

[OSGeo]

#2872: Upgrade gitea to 1.18.0
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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):

 Will wait til 1.18.1, but might test 1.18.0 on dev before then.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2872#comment:1>
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