[MacPorts] #51310: ImageMagick: update to 7.x

[MacPorts]

#51310: ImageMagick: update to 7.x
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  Reporter:  mopihopi     |      Owner:  ryandesign
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ImageMagick  |
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Comment (by jbouttier):

 I recently installed (via nvm/npm) thumbsup (https://thumbsup.github.io/)
 which requires version 7 of ImageMagick to handle HEIC files. So I would
 be very interested in a positive resolution of the current ticket.

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Ticket URL: <https://trac.macports.org/ticket/51310#comment:60>
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