[MacPorts] #59686: asio: Update to 1.18.0 (was: asio: Update to 1.14.0)

[MacPorts]

#59686: asio: Update to 1.18.0
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  Reporter:  ryandesign  |      Owner:  Lord-Kamina
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  asio        |
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Comment (by ryandesign):

 [https://sourceforge.net/projects/asio/files/asio/1.18.0%20%28Stable%29/
 1.18.0 is available].

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Ticket URL: <https://trac.macports.org/ticket/59686#comment:1>
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