[MacPorts] #57597: zstd: Update to 1.3.7

[MacPorts]

#57597: zstd: Update to 1.3.7
------------------------+------------------------
 Reporter:  ryandesign  |      Owner:  seanfarley
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  zstd
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 {{{
 zstd seems to have been updated (port version: 1.3.4, new version: 1.3.7)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57597>
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