[MacPorts] #68790: qt5-qtcreator: move to a newer llvm which is supported on newer macOS versions

[MacPorts]

#68790: qt5-qtcreator: move to a newer llvm which is supported on newer macOS
versions
--------------------------+---------------------------------
 Reporter:  barracuda156  |      Owner:  MarcusCalhoun-Lopez
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:  sonoma        |       Port:  qt5-qtcreator
--------------------------+---------------------------------
 Currently trying to build `qt5-qtcreator` on Sonoma results in:
 {{{
 --->  Computing dependencies for qt5-qtcreator....llvm-12 is known to
 fail.
 }}}

 Also #64887

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Ticket URL: <https://trac.macports.org/ticket/68790>
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