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

[MacPorts]

#65623: ffmpeg: update to 6.x
-------------------------+----------------------
  Reporter:  janngobble  |      Owner:  mascguy
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:
      Port:  ffmpeg      |
-------------------------+----------------------

Comment (by mohd-akram):

 What are the issues with updating to FFmpeg 6? Perhaps there should be an
 ffmpeg4 port that lives in libexec for ports that require an old version,
 and otherwise update to 6.

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Ticket URL: <https://trac.macports.org/ticket/65623#comment:10>
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