[MacPorts] #67730: libproxy: update to 0.5.3

[MacPorts]

#67730: libproxy: update to 0.5.3
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  dbevans
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  libproxy      |
---------------------------+----------------------

Comment (by lcvisser):

 The `libproxy` implementation was rewritten entirely in 0.5.0 (first
 release after 0.4.18), including using meson instead of CMake. I've
 submitted https://github.com/macports/macports-ports/pull/26855#

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Ticket URL: <https://trac.macports.org/ticket/67730#comment:2>
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