[MacPorts] #68851: fgsl @1.4.0: Update to 1.5.0

[MacPorts]

#68851: fgsl @1.4.0: Update to 1.5.0
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 Reporter:  Dave-Allured  |      Owner:  tenomoto
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  fgsl
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 * Update to 1.5.0.
 * Add to description:  This version FGSL 1.5.0 is for use with GSL 2.6.
 * Add link to upstream github repo.
 * Fix livecheck.
 * Add Dave-Allured (dave.allured noaa.gov) as co-maintainer.

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Ticket URL: <https://trac.macports.org/ticket/68851>
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