[MacPorts] #56294: boost: update to 1.67.0

[MacPorts]

#56294: boost: update to 1.67.0
------------------------+------------------------
  Reporter:  michaelld  |      Owner:  ryandesign
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  boost      |
------------------------+------------------------

Comment (by elfprince13):

 There are also some changes in the interaction between CMake and
 Boost::python, which may be non-backwards compatible.

-- 
Ticket URL: <https://trac.macports.org/ticket/56294#comment:3>
MacPorts <https://www.macports.org/>
Ports system for macOS