[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
--------------------------+-------------------------
  Reporter:  bal-agates   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:  cvxopt py39
      Port:  py-cvxopt    |
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Changes (by bal-agates):

 * Attachment "Portfile.127" added.

 Proposed upgraded py-cvxopt Portfile version 1.2.7_0

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