[MacPorts] #39087: py-pip: Update to 1.3.1

[MacPorts]

#39087: py-pip: Update to 1.3.1
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  Reporter:  leone.parise@…  |      Owner:  macports-tickets@…
      Type:  update          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  py-pip          |
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Comment (by Peter.Danecek@…):

 Port is now `py-pip @1.5.2`, most recent version at 1.5.4. So the ticket
 is outdated, but the port as well.

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Ticket URL: <https://trac.macports.org/ticket/39087#comment:3>
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