[MacPorts] #68039: difftastic: update port to 0.51.1

[MacPorts]

#68039: difftastic: update port to 0.51.1
-------------------------+-------------------------
  Reporter:  sierkb      |      Owner:  herbygillot
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:
      Port:  difftastic  |
-------------------------+-------------------------

Comment (by herbygillot):

 Didn't see this ticket in time, but this was done today in
 https://github.com/macports/macports-
 ports/commit/d3b3ed4b1ab37cd416aee899ef694b8465daee9c

 You will want to run `sudo port selfupdate`, followed by `sudo port
 upgrade outdated`.

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Ticket URL: <https://trac.macports.org/ticket/68039#comment:3>
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