[SAC] [OSGeo] #2174: Upgrade Mailman version to recent 2.1.27 release

[OSGeo]

#2174: Upgrade Mailman version to recent 2.1.27 release
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 Reporter:  Jeff McKenna   |       Owner:  strk
     Type:  task           |      Status:  assigned
 Priority:  normal         |   Milestone:  Sysadmin Contract 2020-II
Component:  Systems Admin  |  Resolution:
 Keywords:  mailman        |
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Comment (by strk):

 Newest official debian package for mailman is for 2.1.29 and is targetting
 debian unstable (10): https://tracker.debian.org/pkg/mailman
 We're running old-old-stable (8)

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2174#comment:7>
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