[MacPorts] #69830: byobu: Update to 6.12

[MacPorts]

#69830: byobu: Update to 6.12
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  l2dy
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  byobu
------------------------+----------------------
 byobu has moved to https://github.com/dustinkirkland/byobu and version
 6.12 is available there.

 There are some other open tickets about byobu you might want to address at
 the same time.

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Ticket URL: <https://trac.macports.org/ticket/69830>
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