[MacPorts] #66989: snac: Update to 2.23

[MacPorts]

#66989: snac: Update to 2.23
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  artkiver
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  snac
------------------------+----------------------
 {{{
 % port livecheck snac
 snac seems to have been updated (port version: 2.18, new version: 2.23)
 }}}
 Also discussed (with a WIP update to 2.19) in #66751.

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Ticket URL: <https://trac.macports.org/ticket/66989>
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