[MacPorts] #54750: carthage @0.24.0: update to 0.26.0 (was: carthage @0.24.0: update to 0.25.0)

[MacPorts]

#54750: carthage @0.24.0: update to 0.26.0
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  Reporter:  l2dy      |      Owner:  seanfarley
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  carthage  |
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Comment (by l2dy):

 https://github.com/Carthage/Carthage/releases/tag/0.26.0
 > Carthage now requires Swift 4.0 / Xcode 9.

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Ticket URL: <https://trac.macports.org/ticket/54750#comment:2>
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