[MacPorts] #49826: libssh2: update to 1.6.0

[MacPorts]

#49826: libssh2: update to 1.6.0
--------------------------+----------------------
 Reporter:  ryandesign@…  |      Owner:  normen@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  libssh2
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 The port should probably be updated:

 {{{
 $ port livecheck libssh2
 libssh2 seems to have been updated (port version: 1.4.3, new version:
 1.6.0)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/49826>
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