[MacPorts] #57381: pdfpc @3.1.1_3: Update port to version 4.2.1

[MacPorts]

#57381: pdfpc @3.1.1_3: Update port to version 4.2.1
---------------------+----------------------
  Reporter:  maehne  |      Owner:  (none)
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  haspatch
      Port:  pdfpc   |
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Comment (by Schamschula):

 This port is nomaintainer.

 To get this committed quickly, I suggest opening a Pull Request on github
 https://github.com/macports/macports-ports/pulls.

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Ticket URL: <https://trac.macports.org/ticket/57381#comment:2>
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