[MacPorts] #43222: mkvtoolnix: upgrade to version 6.8.0

[MacPorts]

#43222: mkvtoolnix: upgrade to version 6.8.0
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  Reporter:  dgonyier@…  |      Owner:  macports-tickets@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by mojca@…):

 Replying to [comment:5 egall@…]:
 > mkvtoolnix already has a dependency on the ruby port, so I doubt that
 what the system ruby is on the buildbots matters...

 It does because the file is using `#!/usr/bin/env ruby`.

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Ticket URL: <https://trac.macports.org/ticket/43222#comment:7>
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