[MacPorts] #64489: py-altair: add python310?

[MacPorts]

#64489: py-altair: add python310?
------------------------+----------------------
  Reporter:  jowens     |      Owner:  stromnov
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:
      Port:  py-altair  |
------------------------+----------------------
Changes (by jmroot):

 * status:  new => assigned
 * cc: stromnov (removed)
 * owner:  (none) => stromnov


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Ticket URL: <https://trac.macports.org/ticket/64489#comment:2>
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