[MacPorts] #51656: Update Git to 2.9.0

[MacPorts]

#51656: Update Git to 2.9.0
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 Reporter:  macports.org@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.3.4
 Keywords:                  |       Port:  git
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 Git 2.9.0 was [https://github.com/git/git/releases/tag/v2.9.0 released on
 2016-06-13] with various UI, configuration and submodule improvements.

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Ticket URL: <https://trac.macports.org/ticket/51656>
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