[MacPorts] #42759: R port version bump to 3.0.3

[MacPorts]

#42759: R port version bump to 3.0.3
---------------------------------+--------------------------------
 Reporter:  kjell.konis@…        |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  R
---------------------------------+--------------------------------
 R port version bump to 3.0.3. Also, since there are now something like 90
 CRAN mirrors worldwide, I changed master_sites to
 http://cran.rstudio.com/... which does "automatic redirection to servers
 worldwide".

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Ticket URL: <https://trac.macports.org/ticket/42759>
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