[MacPorts] #71202: py-cryptography: update to 43.0.3, add py313 subport

[MacPorts]

#71202: py-cryptography: update to 43.0.3, add py313 subport
-------------------------+-----------------------------
 Reporter:  Schamschula  |      Owner:  stromnov
     Type:  defect       |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  py-cryptography
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 py-cryptography has been updated to 43.0.3. Version 42.0.5 is incompatible
 with py313, as pyo3* only supports up to py312..

 Updating rust based ports seems to involve some magic, hence I'm deferring
 to the maintainer.

 This is currently blocking me from adding py313 support to several
 dependent ports, particularly py-dnspython and dnsdiag.

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Ticket URL: <https://trac.macports.org/ticket/71202>
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