[MacPorts] #57923: carthage @0.30.1_0: update to 0.31.2

[MacPorts]

#57923: carthage @0.30.1_0: update to 0.31.2
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 Reporter:  FranklinYu  |      Owner:  seanfarley
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  carthage
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Ticket URL: <https://trac.macports.org/ticket/57923>
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