[MacPorts] #50200: mapnik: update to 3.0.9

[MacPorts]

#50200: mapnik: update to 3.0.9
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 Reporter:  ryandesign@…  |      Owner:  macports@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  mapnik
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 mapnik probably should be updated to the latest version, currently 3.0.9.

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Ticket URL: <https://trac.macports.org/ticket/50200>
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