[MacPorts] #43339: Update arb to 6.0

[MacPorts]

#43339: Update arb to 6.0
------------------------------+---------------------------------
  Reporter:  matt.cottrell@…  |      Owner:  macports-tickets@…
      Type:  update           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.2.1
Resolution:                   |   Keywords:  haspatch maintainer
      Port:  arb              |
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Comment (by macsforever2000@…):

 Note these issues:

 {{{
 $ port lint --nitpick
 --->  Verifying Portfile for arb
 Error: Unknown dependency: glib
 Warning: no license set
 --->  1 errors and 1 warnings found.
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/43339#comment:5>
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