[MacPorts] #64756: py-phonenumbers: Add py310 subport

[MacPorts]

#64756: py-phonenumbers: Add py310 subport
--------------------+-----------------------------
 Reporter:  mf2k    |      Owner:  lpsinger
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-phonenumbers
--------------------+-----------------------------
 Please add a py310 subport to py-phonenumbers.

 {{{
 % port info py-phonenumbers
 py-phonenumbers @8.12.19 (python, textproc)
 Sub-ports:            py27-phonenumbers, py35-phonenumbers,
 py36-phonenumbers, py37-phonenumbers, py38-phonenumbers, py39-phonenumbers
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64756>
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