[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):

 The author of Cheetah3 says he reluctantly forked because of Cheetah's
 author inaction. The forks should be a drop-in replacement:

 > The worst deficiency for Cheetah 2 is that it only supports Python 2. I
 needed to update it for Python 3. The old repository has a number of pull
 requests — I applied them to Cheetah 3. Also I received a few pull
 requests for Cheetah 3. And I implemented a number of small features,
 modernized build and test infrastructure, updated docs to be build with
 Sphinx. I continue working on it but I don't plan any revolution. Not even
 major features.

 Given this, the fact that Cheetah2 hasn't been updated in 7 years and the
 fact that Cheetah2 is being used by just a handful of ports, both options
 are feasible. Perhaps the simplest one would be to update `py-cheetah` to
 use Cheetah3 and test the ports which currently use it.

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Ticket URL: <https://trac.macports.org/ticket/55512#comment:8>
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