[MacPorts] #58120: libpsl: move build dependencies to python3

[MacPorts]

#58120: libpsl: move build dependencies to python3
----------------------+--------------------
 Reporter:  dmarteau  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.5.4
 Keywords:            |       Port:  libpsl
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 As we are close to python2 EOL, it should be time to consider to moving
 build dependencies from python2 to python3.

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Ticket URL: <https://trac.macports.org/ticket/58120>
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