[MacPorts] #55699: R @3.4.2: update to 3.4.3

[MacPorts]

#55699: R @3.4.2: update to 3.4.3
---------------------------------+-----------------
 Reporter:  kjellpk              |      Owner:
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  haspatch maintainer  |       Port:  R
---------------------------------+-----------------
 Pretty straightforward, just bumped the version number and updated the
 checksums.

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Ticket URL: <https://trac.macports.org/ticket/55699>
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