[MacPorts] #56294: boost: update to 1.69.0

[MacPorts]

#56294: boost: update to 1.69.0
------------------------+---------------------------------
  Reporter:  michaelld  |      Owner:  ryandesign
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch maintainer
      Port:  boost      |
------------------------+---------------------------------

Comment (by elfprince13):

 Any update on the progress on this? I'm working on a project where my
 collaborators are on Linux with 1.67, and constantly having to `git
 stash`/`git stash pop` this patch in our CMake:
 -find_package(Boost 1.65 REQUIRED COMPONENTS system context python27)
 +find_package(Boost 1.65 REQUIRED COMPONENTS system context python)

 Is...annoying.

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Ticket URL: <https://trac.macports.org/ticket/56294#comment:15>
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