[MacPorts] #57729: opencv: please update to version 4.0

[MacPorts]

#57729: opencv: please update to version 4.0
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  Reporter:  gallafent  |      Owner:  stromnov
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.4
Resolution:             |   Keywords:
      Port:  opencv     |
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Comment (by luzpaz):

 4.0.1 is latest stable

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Ticket URL: <https://trac.macports.org/ticket/57729#comment:1>
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