[MacPorts] #55989: Use MacPorts git when fetch.type git on OS X Mountain Lion and earlier

[MacPorts]

#55989: Use MacPorts git when fetch.type git on OS X Mountain Lion and earlier
------------------------+-----------------------------
 Reporter:  ryandesign  |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:  MacPorts Future
Component:  base        |    Version:
 Keywords:              |       Port:
------------------------+-----------------------------
 Similar to #55933 for using MacPorts svn on El Capitan and older, we need
 to use MacPorts git on Mountain Lion and older, because GitHub has
 increased their minimum security requirements.

 {{{
 fatal: unable to access 'https://github.com/loadimpact/k6.git/':
 error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol
 version
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55989>
MacPorts <https://www.macports.org/>
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