[MacPorts] #43762: Update arb to 6.0-rc2

[MacPorts]

#43762: Update arb to 6.0-rc2
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 Reporter:  matt.cottrell@…      |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  arb
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 This update fixes runtime errors reported by several arb users that I
 missed in my testing of arb 6.0-rc1.

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Ticket URL: <https://trac.macports.org/ticket/43762>
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