[MacPorts] #60645: app PortGroup specifies using bash, but Catalina no longer uses bash

[MacPorts]

#60645: app PortGroup specifies using bash, but Catalina no longer uses bash
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  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by ryandesign):

 /bin/bash still exists on Catalina so there is no urgent need to change
 anything. Perhaps it will disappear in a future version of macOS.

 Presumably the script is simple enough and POSIX-compliant enough that we
 should be specifying /bin/sh instead. But if the portgroup's script
 generation is changed, all ports that use that script generation should
 have their revisions increased.

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Ticket URL: <https://trac.macports.org/ticket/60645#comment:2>
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