[MacPorts] #54401: py-pydot: update to version 1.2.3 enable py3 subports

[MacPorts]

#54401: py-pydot: update to version 1.2.3 enable py3 subports
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 Reporter:  petrrr  |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-pydot
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 `pydot` development is now active again and takes place at GitHub:
 https://github.com/erocarrera/pydot.

 PyPI: https://pypi.python.org/pypi/pydot/1.2.3

 It declares to support Py3 as we.

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Ticket URL: <https://trac.macports.org/ticket/54401>
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