[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:
 Keywords:  haspatch  |       Port:  flex
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 Please update flex to 2.6.3. I have included a patch to the portfile for
 the purpose. The project has moved to Github, which is reflected in my
 updated portfile. Note that the normal github fetch mechanism doesn't work
 so I included a new master_sites instead.

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