[MacPorts] #58727: xorg-xcb-proto @1.13_1: should default to variant python37

[MacPorts]

#58727: xorg-xcb-proto @1.13_1: should default to variant python37
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 Reporter:  FranklinYu   |      Owner:  jeremyhu
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  xorg-xcb-proto
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 Currently it defaults to Python 2.7.

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Ticket URL: <https://trac.macports.org/ticket/58727>
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