[MacPorts] #68583: balsa: update to 2.6.4

[MacPorts]

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

Comment (by ryandesign):

 Confirming that I believe the licensing change from GPL-3 to GPL-2+ is
 correct according to https://gitlab.gnome.org/GNOME/balsa/-/issues/27.

 Replying to [ticket:68583 contextnerror]:
 > Partial portfile, existing patches should be done. I think I've done all
 I can here.

 Does it work for you? What more do you believe needs to be done?

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Ticket URL: <https://trac.macports.org/ticket/68583#comment:2>
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