[MacPorts] #71377: github-1.0: Use more specific automatically-generated tarball URLs to ensure they come from tags, not branches

[MacPorts]

#71377: github-1.0: Use more specific automatically-generated tarball URLs to
ensure they come from tags, not branches
------------------------+------------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  github-1.0
------------------------+------------------------
 See prior discussion in #70652 and #71368.

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Ticket URL: <https://trac.macports.org/ticket/71377>
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