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

[MacPorts]

#64489: py-altair: add python310?
------------------------+--------------------
  Reporter:  jowens     |      Owner:  (none)
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:
      Port:  py-altair  |
------------------------+--------------------
Changes (by reneeotten):

 * version:   => 2.7.1
 * type:  enhancement => update


Comment:

 the latest upstream version of the port (4.2.0) claims to support Python
 3.10 - so updating the port should allow for the addition of the py310
 subport.

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Ticket URL: <https://trac.macports.org/ticket/64489#comment:1>
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