[MacPorts] #61264: Update gstreamer1 to 1.18.4

[MacPorts]

#61264: Update gstreamer1 to 1.18.4
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  Reporter:  Gcenx       |      Owner:  (none)
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gstreamer1  |
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Comment (by reneeotten):

 the port is {{{nomaintainer}}} so if you're really interested in getting
 this updated a PR to do so would be recommended (as this ticket has been
 open for 7 months now without any activity).

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Ticket URL: <https://trac.macports.org/ticket/61264#comment:4>
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