[MacPorts] #29571: mkvtoolnix: update to 4.8.0

[MacPorts]

#29571: mkvtoolnix: update to 4.8.0
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 Reporter:  Kona8lend@…          |       Owner:  macports-tickets@…                   
     Type:  update               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  1.9.2                                
 Keywords:  haspatch             |        Port:                                       
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 - bump mkvtoolnix 4.7.0 -> 4.8.0

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Ticket URL: <https://trac.macports.org/ticket/29571>
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