[MacPorts] #52282: gradle: update to 3.1

[MacPorts]

#52282: gradle: update to 3.1
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 Reporter:  aaron+macports@…     |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  maintainer haspatch  |       Port:  gradle
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Ticket URL: <https://trac.macports.org/ticket/52282>
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