[MacPorts] #74322: macports-libcxx: bump to clang-16?

[MacPorts]

#74322: macports-libcxx: bump to clang-16?
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  Reporter:  nilFinx          |      Owner:  (none)
      Type:  enhancement      |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  macports-libcxx  |
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Comment (by nilFinx):

 oh, was already mentioned:
 https://github.com/macports/macports-ports/pull/31641

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Ticket URL: <https://trac.macports.org/ticket/74322#comment:1>
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