[MacPorts] #37411: py-pyface version update to 4.2.0

[MacPorts]

#37411: py-pyface version update to 4.2.0
---------------------------------+--------------------------------
 Reporter:  jjstickel@…          |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.1.2
 Keywords:  maintainer haspatch  |       Port:  py-pyface
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 Portfile patch attached. I have tested this port as a dependency to
 mayavi.

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Ticket URL: <https://trac.macports.org/ticket/37411>
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