[MacPorts] #58121: shellcheck @0.3.8: update to 0.6.0

[MacPorts]

#58121: shellcheck @0.3.8: update to 0.6.0
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 Reporter:  FranklinYu  |      Owner:  neverpanic
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  shellcheck
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Ticket URL: <https://trac.macports.org/ticket/58121>
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