[MacPorts] #50272: vowpal_wabbit: update to version 8.1.1

[MacPorts]

#50272: vowpal_wabbit: update to version 8.1.1
------------------------+---------------------------
 Reporter:  stromnov@…  |      Owner:  hum@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  haspatch    |       Port:  vowpal_wabbit
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 Update to version 8.1.1 (also resolves #50205).

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Ticket URL: <https://trac.macports.org/ticket/50272>
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