[MacPorts] #51615: cgal: Update to 4.8.1

[MacPorts]

#51615: cgal: Update to 4.8.1
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 Reporter:  dstrubbe@…  |      Owner:  vince@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  haspatch    |       Port:  cgal
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 Update to version 4.8.1 and fix description, homepage, and livecheck.

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Ticket URL: <https://trac.macports.org/ticket/51615>
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