[MacPorts] #53515: mapnik: Update to 3.0.12

[MacPorts]

#53515: mapnik: Update to 3.0.12
------------------------+------------------------
 Reporter:  ryandesign  |      Owner:  macports@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  mapnik
------------------------+------------------------
 {{{
 $ port livecheck mapnik
 mapnik seems to have been updated (port version: 3.0.10, new version:
 3.0.12)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/53515>
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