[MacPorts] #59429: ocaml: Update to 4.12.0 and fix livecheck

[MacPorts]

#59429: ocaml: Update to 4.12.0 and fix livecheck
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  Reporter:  ryandesign  |      Owner:  pmetzger
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  ocaml       |
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Comment (by ryandesign):

 Replying to [comment:11 pmetzger]:
 > I've updated ocaml to 4.12.0

 in [b2f14bfb064c1cab87eb4c8ea85f57d5b92f07c5/macports-ports]

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Ticket URL: <https://trac.macports.org/ticket/59429#comment:14>
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