[MacPorts] #34669: gwyddion: Update to version 2.28

[MacPorts]

#34669: gwyddion: Update to version 2.28
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 Reporter:  feranick@…            |       Owner:  rowue@…           
     Type:  update                |      Status:  new               
 Priority:  Normal                |   Milestone:                    
Component:  ports                 |     Version:  2.1.1             
 Keywords:                        |        Port:  gwyddion          
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Comment(by feranick@…):

 Any update on this?

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Ticket URL: <https://trac.macports.org/ticket/34669#comment:3>
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