[MacPorts] #71748: boost PG: update default version to 1.87

[MacPorts]

#71748: boost PG: update default version to 1.87
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  Reporter:  mohd-akram  |      Owner:  (none)
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  boost       |
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Comment (by ryandesign):

 Can't change the default boost version of the boost portgroup unless you
 first set the boost version to that version in all of the ports that don't
 currently set a boost version.

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Ticket URL: <https://trac.macports.org/ticket/71748#comment:1>
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