[MacPorts] #35444: ocaml-duppy - update to v0.4.2

[MacPorts]

#35444: ocaml-duppy - update to v0.4.2
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 Reporter:  mww@…             |       Owner:  toots@…             
     Type:  update            |      Status:  new                 
 Priority:  Normal            |   Milestone:                      
Component:  ports             |     Version:  2.1.2               
 Keywords:                    |        Port:  ocaml-duppy         
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 update ocaml-duppy to version 0.4.2

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Ticket URL: <https://trac.macports.org/ticket/35444>
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