[MacPorts] #61801: opencv4: update to 4.5.0

[MacPorts]

#61801: opencv4: update to 4.5.0
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  Reporter:  mascguy  |      Owner:  mascguy
      Type:  update   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  opencv4  |
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Comment (by Schamschula):

 FYI: upstream opencv4 is up to 4.5.1

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Ticket URL: <https://trac.macports.org/ticket/61801#comment:2>
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