[MacPorts] #66785: cairo, cairo-devel: Update to 1.17.6

[MacPorts]

#66785: cairo, cairo-devel: Update to 1.17.6
---------------------------------+------------------------
  Reporter:  Jehan               |      Owner:  ryandesign
      Type:  update              |     Status:  accepted
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  cairo, cairo-devel  |
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Comment (by ryandesign):

 It looks like they have also now added the 1.17.6 distfile so I will
 update the ports using that.

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Ticket URL: <https://trac.macports.org/ticket/66785#comment:3>
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