[MacPorts] #49655: update gitflow AVH to 1.9.1

[MacPorts]

#49655: update gitflow AVH to 1.9.1
---------------------------------+--------------------------------
 Reporter:  jason-macports@…     |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  git-flow-avh
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 Update gitflow AVH edition to v1.9.1 released 2015-10-20, which will
 hopefully address #49639.

 Also set `livecheck.type none` on `git-flow-devel` version to avoid
 confusion described in #47500

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Ticket URL: <https://trac.macports.org/ticket/49655>
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