[MacPorts] #28583: arb: fix livecheck

[MacPorts]

#28583: arb: fix livecheck
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 Reporter:  ryandesign@…             |       Owner:  matt.cottrell@…     
     Type:  enhancement              |      Status:  new                 
 Priority:  Normal                   |   Milestone:                      
Component:  ports                    |     Version:  1.9.2               
 Keywords:                           |        Port:  arb                 
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 Here's a minor update to fix arb's livecheck, so that `port livecheck arb`
 should actually tell us when a new version is available. Look ok to
 commit?

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Ticket URL: <https://trac.macports.org/ticket/28583>
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