[MacPorts] #68468: cloudflared @2023.8.2 @2023.10.0 build fails: does not build with Go 1.21

[MacPorts]

#68468: cloudflared @2023.8.2 @2023.10.0 build fails: does not build with Go 1.21
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  Reporter:  michiow      |      Owner:  i0ntempest
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.8.1
Resolution:               |   Keywords:
      Port:  cloudflared  |
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Comment (by i0ntempest):

 Until upstream adds compatibility there's no way it can be fixed in
 MacPorts, and I am not willing to hold version on this as old versions
 could have security holes. If the next version still has no support of Go
 1.21 I'll add a version check to stop the build if Go version is too new.

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Ticket URL: <https://trac.macports.org/ticket/68468#comment:5>
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