[MacPorts] #46241: git-flow update: bump subport git-flow-avh v1.7.0 -> v1.8.0

[MacPorts]

#46241: git-flow update: bump subport git-flow-avh v1.7.0 -> v1.8.0
-------------------------------+---------------------------------
  Reporter:  jason-macports@…  |      Owner:  macports-tickets@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.3.3
Resolution:                    |   Keywords:  haspatch maintainer
      Port:  git-flow-avh      |
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Comment (by ryandesign@…):

 Why doesn't this subport fetch from a distfile? The other three subports
 use `git submodule update --init`, which is a valid reason to use
 `fetch.type git`, but git-flow-avh doesn't.

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Ticket URL: <https://trac.macports.org/ticket/46241#comment:2>
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