[MacPorts] #39715: Update raxml to version 7.6.6

[MacPorts]

#39715: Update raxml to version 7.6.6
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  Reporter:  mattoates@…  |      Owner:  macports-tickets@…
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:  raxml        |
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Comment (by egall@…):

 A few things off the top of my head:

 - You don't have to cc yourself, ticket reporters are automatically
 notified anyway
 - See if you can get upstream to supply an actual tag to download from,
 instead of just a hash
 - Try to use at least 2 checksums. Since you're already using sha256, the
 next strongest one after that (that MacPorts supports) is rmd160.

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Ticket URL: <https://trac.macports.org/ticket/39715#comment:2>
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