[MacPorts] #60383: opencv4: update to 4.3.0

[MacPorts]

#60383: opencv4: update to 4.3.0
--------------------------+----------------------
 Reporter:  chrstphrchvz  |      Owner:  stromnov
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  opencv4
--------------------------+----------------------
 Current version in MacPorts is 4.2.0 (released 2019-12-23); 4.3.0 was
 released 2020-04-06

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Ticket URL: <https://trac.macports.org/ticket/60383>
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