[MacPorts] #65623: ffmpeg: update to 6.x

[MacPorts]

#65623: ffmpeg: update to 6.x
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  Reporter:  janngobble  |      Owner:  mascguy
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:
      Port:  ffmpeg      |
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Comment (by andlabs):

 FWIW I recently ran across an issue where some YouTube videos download in
 a format not supported by ffmpeg 4. The yt-dlp maintainers are expecting
 everyone to be on 6.1.1 at leat. Perhaps that port can be moved to depend
 on ffmpeg 6? https://github.com/yt-dlp/yt-dlp/issues/8641

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Ticket URL: <https://trac.macports.org/ticket/65623#comment:27>
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