[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  |
------------------------+----------------------

Comment (by reneeotten):

 open a PR for this change [https://github.com/macports/macports-
 ports/pull/13815 here]; we'll wait a bit for the maintainer, but should be
 able to get this committed fairly quickly as this ticket has been open for
 more than a week already.

-- 
Ticket URL: <https://trac.macports.org/ticket/64489#comment:3>
MacPorts <https://www.macports.org/>
Ports system for macOS