[MacPorts] #72165: py-altair: add py313-altair subport

[MacPorts]

#72165: py-altair: add py313-altair subport
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 Reporter:  jowens       |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  py-altair
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 Any chance of adding python 3.13 to py-altair? Thanks.

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Ticket URL: <https://trac.macports.org/ticket/72165>
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