[MacPorts] #67937: libassuan: update to 2.5.6

[MacPorts]

#67937: libassuan: update to 2.5.6
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 Reporter:  barracuda156  |      Owner:  larryv
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  libassuan
--------------------------+-----------------------
 The port is outdated.

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Ticket URL: <https://trac.macports.org/ticket/67937>
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