[MacPorts] #50671: boost: Update to 1.60.0

[MacPorts]

#50671: boost: Update to 1.60.0
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  Reporter:  eborisch@…  |      Owner:  ryandesign@…
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  haspatch
      Port:  boost       |
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Comment (by larryv@…):

 No, using static libraries without immediate revbumping is not an option.
 The builds of such dependents would [[ReproducibleBuilds|not be
 reproducible]]. A `foo @1.2_3` built before a `boost` upgrade would not be
 the same as a `foo @1.2_3` built immediately after, but we would not be
 able to distinguish them without technically invasive measures.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:15>
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