[MacPorts] #54450: py-docker @1.8.1: Update to 2.4.2

[MacPorts]

#54450: py-docker @1.8.1: Update to 2.4.2
--------------------+-----------------------
 Reporter:  zdw     |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.4.1
 Keywords:          |       Port:  py-docker
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 Update py-docker to version 2.4.2

 Note - this depends on this new port: {{{ py-dockerpy-creds }}}, which is
 submitted here: https://trac.macports.org/ticket/54449

 This will break the {{{ docker-compose }}} port unless it is updated.
 Will link to that patch for that once submitted.

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Ticket URL: <https://trac.macports.org/ticket/54450>
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