[MacPorts] #63272: zsh: killed port upg outdated in Big Sur

[MacPorts]

#63272: zsh: killed port upg outdated in Big Sur
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  Reporter:  stuchalk  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  base      |    Version:  2.7.1
Resolution:            |   Keywords:  bigsur
      Port:            |
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Comment (by stuchalk):

 XCode 12.5.1.  Additionally, I updated to MacOS 11.5 yesterday and still
 see the problem...

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Ticket URL: <https://trac.macports.org/ticket/63272#comment:3>
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