[MacPorts] #51463: Use json endpoint for pypi livecheck

[MacPorts]

#51463: Use json endpoint for pypi livecheck
---------------------------+--------------------------------
 Reporter:  xeron.oskom@…  |      Owner:  macports-tickets@…
     Type:  enhancement    |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:  haspatch       |       Port:
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 Previously used XML page is not available for some packages (it redirects
 to JSON page).

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Ticket URL: <https://trac.macports.org/ticket/51463>
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