[MacPorts] #51240: gradle: update to 2.13

[MacPorts]

#51240: gradle: update to 2.13
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 Reporter:  aaron+macports@…  |      Owner:  macports-tickets@…
     Type:  update            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.3.4
 Keywords:  haspatch          |       Port:  gradle
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Ticket URL: <https://trac.macports.org/ticket/51240>
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