[MacPorts] #33671: libpqxx: update to 4.0

[MacPorts]

#33671: libpqxx: update to 4.0
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  dweber@…           
     Type:  defect                   |      Status:  new                
 Priority:  Normal                   |   Milestone:                     
Component:  ports                    |     Version:  2.0.4              
 Keywords:                           |        Port:  libpqxx            
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 {{{
 $ port livecheck libpqxx
 libpqxx seems to have been updated (port version: 3.0.2, new version: 4.0)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/33671>
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