[MacPorts] #57769: py-passlib: add py37 subport

[MacPorts]

#57769: py-passlib: add py37 subport
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 Reporter:  petrrr       |      Owner:  nerdling
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  py-passlib
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 Required by a one of the ports I maintain.

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Ticket URL: <https://trac.macports.org/ticket/57769>
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