[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 ryandesign):

 Replying to [comment:4 l2dy]:
 > Take R for example, it's not viable to automate the version bump in
 base, but the checksum could be automatically updated.
 >
 > {{{
 > set major 3
 > set minor 3
 > set point 3
 > version                     ${major}.${minor}.${point}
 > }}}

 Aberrations like that should be fixed (e.g. https://github.com/macports
 /macports-ports/pull/1371).

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Ticket URL: <https://trac.macports.org/ticket/53851#comment:13>
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