[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  |   Keywords:
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 https://github.com/go-gitea/gitea/releases/tag/v1.18.0

 added support for push-mirror, which will be useful for postgis case.
 Right now strk has a git mirror script for that to push to github and
 gitlab.  Will be interesting to see how this works.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2872>
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