[MacPorts] #57968: libssh: update to 0.8.6

[MacPorts]

#57968: libssh: update to 0.8.6
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 Reporter:  pmetzger  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  libssh
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 libssh has had some big security fixes and should be updated to 0.8.6 as
 soon as reasonable.

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Ticket URL: <https://trac.macports.org/ticket/57968>
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