[MacPorts] #51568: shellcheck @0.3.8: update to 0.4.6

[MacPorts]

#51568: shellcheck @0.3.8: update to 0.4.6
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  Reporter:  sierkb@…    |      Owner:  neverpanic
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  shellcheck  |
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Comment (by akimd):

 Unfortunately the PR is closed (there were issues that the contributor did
 not have time to address).  Current release is 0.47.

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Ticket URL: <https://trac.macports.org/ticket/51568#comment:7>
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