[MacPorts] #59834: Boost: update to 1.76.0

[MacPorts]

#59834: Boost: update to 1.76.0
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  Reporter:  michaelld  |      Owner:  mascguy
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  boost      |
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Comment (by michaelld):

 Yes please! I've wanted completely separate Boost::PythonXY installs like
 forever ... just never gotten around to dealing with it! If we're making
 port:boostXYZ installable in parallel, then I'd hope we can do the same
 for Boost::PythonXY!

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Ticket URL: <https://trac.macports.org/ticket/59834#comment:27>
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