[MacPorts] #69668: Use newer Xcode on macOS 14 GitHub Actions runner

[MacPorts]

#69668: Use newer Xcode on macOS 14 GitHub Actions runner
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by jmroot):

 Not without spending the significant time it would take to download and
 install it at the start of every CI run. Probably the best we can do is
 ask GitHub to update the version in the image.

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Ticket URL: <https://trac.macports.org/ticket/69668#comment:1>
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