[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 emcrisostomo):

 I asked upstream: https://github.com/CheetahTemplate3/cheetah3/issues/2
 There's not a lot of activity on that repository but perhaps we are lucky.

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Ticket URL: <https://trac.macports.org/ticket/55512#comment:7>
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