[MacPorts] #62340: cask +python27 also depends on python39

[MacPorts]

#62340: cask +python27 also depends on python39
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  Reporter:  ryandesign  |      Owner:  amake
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:
      Port:  cask        |
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Comment (by wyuenho):

 Python has been added into depends-lib twice it seems. Either we make a
 variant python39 and default that variant or we can remove python27, or
 somehow fix the port group so the previous python is removed from depends-
 lib before appending.

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Ticket URL: <https://trac.macports.org/ticket/62340#comment:1>
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