[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:  macports-tickets@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  haspatch
      Port:  py-docker         |
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Comment (by aaron+macports@…):

 This depends on ticket #51495 (which depends on #51494)

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Ticket URL: <https://trac.macports.org/ticket/51496#comment:1>
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