[MacPorts] #55460: postgis2: Update to 2.4.2

[MacPorts]

#55460: postgis2: Update to 2.4.2
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  Veence
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  postgis2
------------------------+----------------------
 {{{
 $ port livecheck postgis2
 postgis2 seems to have been updated (port version: 2.4.0, new version:
 2.4.2)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55460>
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