[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:
 Keywords:          |       Port:  py-cython py-cython-devel
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 Cython 3 has been out for several months now, and a number of projects
 have started requiring it. I would suggest we update py-cython to 3.0.6
 immediately, and deal with any incompatibilities as they arise. For
 anything that can't be expediently patched into compatibility, we can
 create a separate port for the old version that installs into a non-
 conflicting location, and point ports at it via PATH/PYTHONPATH.

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