[MacPorts] #46378: flex: update to 2.5.39

[MacPorts]

#46378: flex: update to 2.5.39
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  Reporter:  rurban@…  |      Owner:  mww@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:
      Port:  flex      |
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Comment (by khindenburg@…):

 2.6.0 was just released which reports to fix this issue.

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Ticket URL: <https://trac.macports.org/ticket/46378#comment:5>
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