[MacPorts] #57436: asciinema: use Python 3.7

[MacPorts]

#57436: asciinema: use Python 3.7
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 Reporter:  mohd-akram   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  asciinema
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Ticket URL: <https://trac.macports.org/ticket/57436>
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