[MacPorts] #50612: py-powerline update to 2.3

[MacPorts]

#50612: py-powerline update to 2.3
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  Reporter:  macports@…    |      Owner:  sean@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  py-powerline  |
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Comment (by sean@…):

 Sure, though, my plate is already getting pretty full. If someone wants
 to, they can just commit this and deprecate the older pythons.

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Ticket URL: <https://trac.macports.org/ticket/50612#comment:4>
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