[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):

 I took approach 2 (build a deb package myself). It's ready for install,
 just waiting for a backup before proceeding. I packaged 2.1.34 (latest
 release in the 2.1 branch)

 I was thinking we could start using our nexus.osgeo.org repository for
 storing these deb files, so to have a "proper" apt repository...
 https://help.sonatype.com/repomanager3/formats/apt-repositories

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2174#comment:8>
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