[MacPorts] #68583: balsa: update to 2.6.4

[MacPorts]

#68583: balsa: update to 2.6.4
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  Reporter:  contextnerror  |      Owner:  (none)
      Type:  update         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:  haspatch
      Port:  balsa          |
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Comment (by contextnerror):

 I think it's https://gitlab.gnome.org/GNOME/balsa/-/issues

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Ticket URL: <https://trac.macports.org/ticket/68583#comment:5>
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