[MacPorts] #58127: iso-codes: move to Debian Gitlab repo, update to latest version 4.2

[MacPorts]

#58127: iso-codes: move to Debian Gitlab repo, update to latest version 4.2
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  Reporter:  dbevans    |      Owner:  ryandesign
      Type:  defect     |     Status:  accepted
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  iso-codes  |
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Comment (by dbevans):

 Maybe better would be to use our debian mirror_sites which are still alive
 and well.

 iso-codes 4.2 can be found at http://ftp.us.debian.org/debian/pool/main/i
 /iso-codes/iso-codes_4.2.orig.tar.xz

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Ticket URL: <https://trac.macports.org/ticket/58127#comment:3>
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