[MacPorts] #49593: root6 : Update to 6.04.08

[MacPorts]

#49593: root6 : Update to 6.04.08
---------------------------------+--------------------------------
 Reporter:  jonesc@…             |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  root6
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 Update to latest ROOT6 version.

 Also switch to internal GSL build, as ROOT is not yet compatible with GSL
 2.0 which was recently released.
 Can be reverted once ROOT adds support.

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Ticket URL: <https://trac.macports.org/ticket/49593>
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