[MacPorts] #26553: ocaml: update to 3.12.0

[MacPorts]

#26553: ocaml: update to 3.12.0
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 Reporter:  ryandesign@…             |       Owner:  mww@…           
     Type:  update                   |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  1.9.1           
 Keywords:                           |        Port:  ocaml           
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 I see ocaml 3.12.0 is available so the ocaml port should probably be
 updated.

 The livecheck may need adjustment; it only found version 3.12.0+beta1, but
 [http://caml.inria.fr/pub/distrib/ocaml-3.12/ ocaml 3.12.0 final is
 available since last month].

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Ticket URL: <https://trac.macports.org/ticket/26553>
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