[MacPorts] #68822: py-chainer: update to current version

[MacPorts]

#68822: py-chainer: update to current version
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  py-chainer    |
---------------------------+--------------------

Comment (by reneeotten):

 the port has no maintainer so it's pretty pointless to open a Trac ticket
 for it. If you want to have it updated, feel free to add it to your
 personal to-do list and submit a PR.

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Ticket URL: <https://trac.macports.org/ticket/68822#comment:1>
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