[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:
 Keywords:  haspatch          |       Port:  py-docker
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Ticket URL: <https://trac.macports.org/ticket/51496>
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