[SAC] [OSGeo] #2926: Fix forward secrecy on osgeo9

[OSGeo]

#2926: Fix forward secrecy on osgeo9
---------------------------+--------------------------------------
 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2023-I
Component:  Systems Admin  |   Keywords:
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 osgeo9 server is getting a B score on SSLabs because of the forward
 secrecy setting

 https://blog.qualys.com/product-tech/2018/02/02/forward-secrecy-
 authenticated-encryption-and-robot-grading-
 update?_ga=2.93270165.907080469.1682616254-892586743.1682616254

 This affects all websites on osgeo9.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2926>
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