[MacPorts] #34527: doxygen: upgrade to 1.8.1

[MacPorts]

#34527: doxygen: upgrade to 1.8.1
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 Reporter:  Deil.Christoph@…          |       Owner:  css@…           
     Type:  update                    |      Status:  assigned        
 Priority:  Normal                    |   Milestone:                  
Component:  ports                     |     Version:  2.1.1           
 Keywords:  haspatch                  |        Port:  doxygen         
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Changes (by css@…):

  * status:  new => assigned


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Ticket URL: <https://trac.macports.org/ticket/34527#comment:2>
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