[MacPorts] #37907: upgrade sbt to 0.12.2

[MacPorts]

#37907: upgrade sbt to 0.12.2
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 Reporter:  sam.halliday@…  |      Owner:  macports-tickets@…
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.1.2
 Keywords:                  |       Port:  sbt
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Ticket URL: <https://trac.macports.org/ticket/37907>
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