[MacPorts] #66852: cairo, cairo-devel: Update to 1.18.0

[MacPorts]

#66852: cairo, cairo-devel: Update to 1.18.0
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  Reporter:  ryandesign         |      Owner:  mascguy
      Type:  update             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.8.1
Resolution:                     |   Keywords:
      Port:  cairo cairo-devel  |
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Comment (by mascguy):

 Replying to [comment:5 mascguy]:
 > As for Meson specifics: The secret sauce is attribute `darwin_versions`,
 a two-element version string array.
 > [...]

 Ugh, my original comment had a few typos, which makes things confusing.

 I've since edited that, and now it's correct. Sorry folks!

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Ticket URL: <https://trac.macports.org/ticket/66852#comment:6>
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