[MacPorts] #47395: Update cantera port for new source

[MacPorts]

#47395: Update cantera port for new source
------------------------+--------------------------------
 Reporter:  macports@…  |      Owner:  macports-tickets@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.3
 Keywords:              |       Port:  cantera
------------------------+--------------------------------
 Cantera is moving to GitHub (see
 https://groups.google.com/forum/?fromgroups#!topic/cantera-
 users/-JyScUZm0O0)

 This update just changes the download source.

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Ticket URL: <https://trac.macports.org/ticket/47395>
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