[MacPorts] #67095: ffmpeg-upstream: update to 6.0

[MacPorts]

#67095: ffmpeg-upstream: update to 6.0
------------------------+-----------------------------
 Reporter:  mohd-akram  |      Owner:  (none)
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  ffmpeg-upstream
------------------------+-----------------------------
 FFmpeg 6 has been released.

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Ticket URL: <https://trac.macports.org/ticket/67095>
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