[MacPorts] #74320: Enable stacked PRs on macports github repo

[MacPorts]

#74320: Enable stacked PRs on macports github repo
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  Reporter:  oakimov         |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by oakimov):

 here is a rollout guide:
 https://docs.github.com/en/pull-requests/tutorials/roll-out-stacked-prs

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Ticket URL: <https://trac.macports.org/ticket/74320#comment:3>
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