[MacPorts] #64076: `echo outdated` shows `zstd` which can't be upgraded

[MacPorts]

#64076: `echo outdated` shows `zstd` which can't be upgraded
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  Reporter:  catap   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 Delete your PortIndex and PortIndex.quick and let MacPorts recreate them.

 See https://lists.macports.org/pipermail/macports-
 dev/2021-October/043840.html

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Ticket URL: <https://trac.macports.org/ticket/64076#comment:1>
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