[MacPorts] #64068: parallel: update to latest upstream release

[MacPorts]

#64068: parallel: update to latest upstream release
---------------------+----------------------
 Reporter:  mascguy  |      Owner:  ci42
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:  parallel
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 It looks like the latest upstream release is `20211122`, while our port is
 `20200922`.

 Let's update, if possible.

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Ticket URL: <https://trac.macports.org/ticket/64068>
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