[MacPorts] #72168: gtkmm3: add python 3.13 support

[MacPorts]

#72168: gtkmm3: add python 3.13 support
-------------------------+--------------------
 Reporter:  jowens       |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  gtkmm3
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 Kindly consider updating this port to support python 3.13.

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Ticket URL: <https://trac.macports.org/ticket/72168>
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