[MacPorts] #60957: scons: Update to version 4.2.0 (was: scons: Update to version 4.0.1)

[MacPorts]

#60957: scons: Update to version 4.2.0
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  Reporter:  mf2k    |      Owner:  ryandesign
      Type:  update  |     Status:  accepted
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  scons   |
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Comment (by mf2k):

 Current version is 4.2.0. It requires python 3.5+. We really need to
 upgrade this port to move away from requiring python 2.7.

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Ticket URL: <https://trac.macports.org/ticket/60957#comment:6>
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