[MacPorts] #23125: graphics/libpng update version, tweak livecheck

[MacPorts]

#23125: graphics/libpng update version, tweak livecheck
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 Reporter:  rmsfisher@…             |       Owner:  ryandesign@…           
     Type:  update                  |      Status:  assigned               
 Priority:  Normal                  |   Milestone:                         
Component:  ports                   |     Version:                         
 Keywords:                          |        Port:  libpng                 
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Comment(by jmr@…):

 Go ahead, this is long since timed out. But use the patch I just attached.
 And don't forget to rev bump all dependents at the same time; you can use
 the script attached to #23260.

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Ticket URL: <https://trac.macports.org/ticket/23125#comment:16>
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