[MacPorts] #53925: Please update flex to 2.6.3

[MacPorts]

#53925: Please update flex to 2.6.3
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  Reporter:  pmetzger  |      Owner:
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch
      Port:  flex      |
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Comment (by mf2k):

 Thanks!

 Note:
 Change the GitHub setup line to the following:
 {{{
 github.setup        westes flex 2.6.3 v
 }}}
 That should allow you to remove the {{{master_sites}}} line entirely and
 use the one generated by the portgroup.

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Ticket URL: <https://trac.macports.org/ticket/53925#comment:1>
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