[MacPorts] #69019: py-mako: Add py312-mako subport

[MacPorts]

#69019: py-mako: Add py312-mako subport
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 Reporter:  ryandesign   |      Owner:  stromnov
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  py-mako
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 Needed to resolve #68888.

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Ticket URL: <https://trac.macports.org/ticket/69019>
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