[MacPorts] #67959: embree: update to 4.2.0

[MacPorts]

#67959: embree: update to 4.2.0
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  Reporter:  luzpaz  |      Owner:  jasonliu--
      Type:  update  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  embree  |
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Comment (by jasonliu--):

 This is not as easy as it might seem at first glance. For example, Blender
 tends to be quite flexible with which versions of its dependencies,
 including Embree, it links to. However, Godot, even in the latest version,
 still depends on Embree 3. I am currently working on updating both the
 Godot and Blender ports to their newest versions; at that time, I might be
 able experiment whether I can simply update the Embree port to the newest
 4.x, or whether I would need to split off an {{{embree3}}} subport to
 maintain compatibility with Godot.

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Ticket URL: <https://trac.macports.org/ticket/67959#comment:4>
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