[MacPorts] #60859: py-isort: Update to 5.1.1

[MacPorts]

#60859: py-isort: Update to 5.1.1
-------------------------+------------------------
  Reporter:  ryandesign  |      Owner:  reneeotten
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py-isort    |
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Comment (by reneeotten):

 true, but an update will break at least {{{py-lint}}} and possibly others
 as these packages have not adapted yet to the not-fully backwards
 compatible update. So for now I am holding off on the update.

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Ticket URL: <https://trac.macports.org/ticket/60859#comment:1>
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