[MacPorts] #52845: mpv 0.21 update

[MacPorts]

#52845: mpv 0.21 update
---------------------+----------------------
  Reporter:  iMiKED  |      Owner:  Ionic
      Type:  update  |     Status:  accepted
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.4
Resolution:          |   Keywords:
      Port:  mpv     |
---------------------+----------------------

Comment (by jf):

 I don't know how far along this update is, but if it's not too much
 trouble, is it ok to update to 0.22.0 instead (see https://github.com/mpv-
 player/mpv/releases/tag/v0.22.0)? Thank you!

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Ticket URL: <https://trac.macports.org/ticket/52845#comment:5>
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