[MacPorts] #53307: Update libvpx to v1.6.1

[MacPorts]

#53307: Update libvpx to v1.6.1
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  Reporter:  johannkoenig  |      Owner:  dbevans
      Type:  update        |     Status:  accepted
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  libvpx        |
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Comment (by johannkoenig):

 Thanks for looking into it. I forgot that index.html needs to be manually
 updated. It should be correct now.

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Ticket URL: <https://trac.macports.org/ticket/53307#comment:3>
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