[MacPorts] #47802: libbiosig: update to 1.6.4

[MacPorts]

#47802: libbiosig: update to 1.6.4
--------------------------+------------------------
 Reporter:  ryandesign@…  |      Owner:  christsc@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  libbiosig
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 It looks like libbiosig 1.6.4 is available, but the port is at 1.6.3. The
 port should probably be updated. livecheck seems to be broken for this
 port, so that should be fixed too.

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Ticket URL: <https://trac.macports.org/ticket/47802>
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