[MacPorts] #67911: libuv: update to 1.50.0

[MacPorts]

#67911: libuv: update to 1.50.0
---------------------------+-----------------------
  Reporter:  barracuda156  |      Owner:  michaelld
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  libuv         |
---------------------------+-----------------------

Comment (by barracuda156):

 `libuv-devel` should be updated first, and there is a PR for that:
 https://github.com/macports/macports-ports/pull/27671

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Ticket URL: <https://trac.macports.org/ticket/67911#comment:3>
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