[MacPorts] #53851: Add target that bumps version and checksum

[MacPorts]

#53851: Add target that bumps version and checksum
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  Reporter:  l2dy         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by danielluke):

 I like this idea. I think the tradeoff for making it easier for
 maintainers to version-bump a port is worth the potential of maintainers
 misuse (I doubt that the current behavior actually results in careless
 maintainers being more careful).

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Ticket URL: <https://trac.macports.org/ticket/53851#comment:9>
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