[MacPorts] #68929: py-cython: update to 3.x

[MacPorts]

#68929: py-cython: update to 3.x
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  Reporter:  jmroot                     |      Owner:  stromnov
      Type:  update                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:
Resolution:                             |   Keywords:
      Port:  py-cython py-cython-devel  |
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Comment (by jmroot):

 If you can provide a list of ports that you know to be incompatible, I'll
 start moving them over to the compatibility version.

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Ticket URL: <https://trac.macports.org/ticket/68929#comment:2>
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