[MacPorts] #55512: py-cheetah: Update to version 3

[MacPorts]

#55512: py-cheetah: Update to version 3
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  Reporter:  mf2k        |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py-cheetah  |
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Comment (by michaelld):

 If they can live side by side, I'd vote for keeping cheetah as is & adding
 in cheetah3.

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Ticket URL: <https://trac.macports.org/ticket/55512#comment:2>
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