[MacPorts] #48221: Bump mpv after ffmpeg 2.7.1 update

[MacPorts]

#48221: Bump mpv after ffmpeg 2.7.1 update
-------------------------+---------------------
  Reporter:  mcg@…       |      Owner:  ionic@…
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.3
Resolution:              |   Keywords:
      Port:  mpv         |
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Comment (by ionic@…):

 This message should be harmless, as `ffmpeg` 2.7.0 and 2.7.1 are binary
 compatible.

 Rather, I have a patch for the newest version 0.9.2 prepared, but need to
 use maintainer timeout on #48192 before pushing that one.

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Ticket URL: <https://trac.macports.org/ticket/48221#comment:2>
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