[MacPorts] #69742: libmamba: Tell the build system to use python312

[MacPorts]

#69742: libmamba: Tell the build system to use python312
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  l2dy
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  libmamba
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 libmamba depends on the python312 port but doesn't tell the build system
 to use that version of python. This may result in the build system using a
 different python that the user happens to have installed—a python with
 which the build system might not be compatible. Better to tell the build
 system which python to use, using a configure argument, environment
 variable, or whatever other means are provided for that by the build
 system.

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Ticket URL: <https://trac.macports.org/ticket/69742>
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