[MacPorts] #64493: py-cvxopt 1.2.5: Upgrade cvxopt version to 1.2.7 and add py39-cvxopt variant

[MacPorts]

#64493: py-cvxopt 1.2.5: Upgrade cvxopt version to 1.2.7 and add py39-cvxopt
variant
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  Reporter:  bal-agates  |      Owner:  jjstickel
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  haspatch
      Port:  py-cvxopt   |
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Comment (by reneeotten):

 opened a PR for you [https://github.com/macports/macports-ports/pull/13814
 here]; we'll give the maintainer a bit of time (which he admittedly
 already had after you opened this Trac ticket, but nonetheless). If all
 looks good we'll get this merged shortly - thanks again!

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Ticket URL: <https://trac.macports.org/ticket/64493#comment:3>
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