[MacPorts] #59834: Boost: update to 1.76.0 (was: Boost: update to 1.74.0)

[MacPorts]

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

 * owner:  (none) => michaelld
 * status:  new => assigned


Old description:

> Boost 1.74.0 was released on 20200814 <
> https://www.boost.org/users/history/version_1_74_0.html >

New description:

 Boost 1.76.0 was released on 20210416:
 https://www.boost.org/users/history/version_1_76_0.html

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Ticket URL: <https://trac.macports.org/ticket/59834#comment:14>
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