[MacPorts] #66633: sundials6 needs an update

[MacPorts]

#66633: sundials6 needs an update
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 Reporter:  barracuda156  |      Owner:  mascguy
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.0
 Keywords:                |       Port:  sundials6
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 `sundials6` is at 6.3.0 version, while the current one is 6.5.0:
 https://ports.macports.org/port/sundials6/details

 P. S. I can make a PR for it, if that is okay.

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Ticket URL: <https://trac.macports.org/ticket/66633>
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