[MacPorts] #65199: libproxy: add python310 variant?

[MacPorts]

#65199: libproxy: add python310 variant?
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 Reporter:  jowens  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libproxy
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 libproxy is required for (e.g.) inkscape, and all other deps of inkscape
 support python 3.10.

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Ticket URL: <https://trac.macports.org/ticket/65199>
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