[MacPorts] #48244: Update opam version to 1.2.2

[MacPorts]

#48244: Update opam version to 1.2.2
---------------------------+--------------------------------
 Reporter:  gavinbeatty@…  |      Owner:  macports-tickets@…
     Type:  update         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.3.3
 Keywords:                 |       Port:  opam
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 As noted in the 1.2.2 release blog post,
 http://opam.ocaml.org/blog/opam-1-2-2-release/, there is a fix for
 https://github.com/ocaml/opam/issues/2077 in 1.2.2 which is highly
 relevant to Mac.

 As such, I'd like to upgrade the Macports version to 1.2.2 so that opam
 invocation times aren't so awful.

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Ticket URL: <https://trac.macports.org/ticket/48244>
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