[MacPorts] #67824: pg github: livecheck: use json api

[MacPorts]

#67824: pg github: livecheck: use json api
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  Reporter:  mascguy      |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.8.1
Resolution:               |   Keywords:  portgroup
      Port:  pg-github    |
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Comment (by mascguy):

 p.s. We'd need to support multiple info sources, including both `tags` and
 `releases`. So that should be configurable.

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Ticket URL: <https://trac.macports.org/ticket/67824#comment:1>
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