[MacPorts] #54449: py-dockerpy-creds @0.2.1 dependency for newer versions of py-docker

[MacPorts]

#54449: py-dockerpy-creds @0.2.1 dependency for newer versions of py-docker
------------------------+-------------------------------
 Reporter:  zdw         |      Owner:
     Type:  submission  |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.4.1
 Keywords:              |       Port:  py-dockerpy-creds
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 Adds py-dockerpy-creds port.  This is required for 2.x versions of the py-
 docker port.

 Name isn't ideal, matches upstream name.

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Ticket URL: <https://trac.macports.org/ticket/54449>
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