[MacPorts] #51496: py-docker: update to version 1.8.1

[MacPorts]

#51496: py-docker: update to version 1.8.1
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  Reporter:  aaron+macports@…  |      Owner:  sean@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  haspatch
      Port:  py-docker         |
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Comment (by sean@…):

 Very cool, thanks for the work. I'll get on this once those other tickets
 are fixed.

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Ticket URL: <https://trac.macports.org/ticket/51496#comment:3>
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