[MacPorts] #70563: py310-grpcio @1.48.4_9 fails to build

[MacPorts]

#70563: py310-grpcio @1.48.4_9 fails to build
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  Reporter:  areilly  |      Owner:  emcrisostomo
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  grpcio   |
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Comment (by jmroot):

 Actually that should be standard C++17. The problem is `-std=c++14` is
 being added to the compiler flags for some reason. Updating is likely
 still the best fix.

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Ticket URL: <https://trac.macports.org/ticket/70563#comment:4>
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