[MacPorts] #58140: cpan2port: Use perl5.28

[MacPorts]

#58140: cpan2port: Use perl5.28
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  Reporter:  hyperbole    |      Owner:  mojca
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:  haspatch
      Port:  cpan2port    |
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Comment (by mojca):

 Thanks a lot.

 I had to modify `cpan2port` to also output 5.28 by default, so there was
 no need for revision bump.

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Ticket URL: <https://trac.macports.org/ticket/58140#comment:3>
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