[MacPorts] #70605: libass: update to 0.17.3

[MacPorts]

#70605: libass: update to 0.17.3
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 Reporter:  luzpaz  |      Owner:  (none)
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libass
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 Tag: https://github.com/libass/libass/releases/tag/0.17.3
 Homebrew: https://github.com/Homebrew/homebrew-
 core/blob/9902bce5708a0f42452cdcd801dbd8725a2f9bbb/Formula/lib/libass.rb

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Ticket URL: <https://trac.macports.org/ticket/70605>
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