[SAC] [OSGeo] #2676: Upgrade gitea from 1.15.4 to 1.15.6 and PostgreSQL from 10 to 12

[OSGeo]

#2676: Upgrade gitea from 1.15.4 to 1.15.6 and PostgreSQL from 10 to 12
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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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 Gitea 1.15.6 came out 3 weeks ago.  We are on gitea 1.15.4.  A lot of
 security updates are included.

 I also want to upgrade from postgresql 10 to postgresql 12.

 I'll do a quick test on dev.git.osgeo.org first before attempting on
 production.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2676>
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