[MacPorts] #54136: protobuf3-cpp: update to version 3.4.0 (was: protobuf3-cpp: update to version 3.3.0)

[MacPorts]

#54136: protobuf3-cpp: update to version 3.4.0
----------------------------+----------------------
  Reporter:  Schamschula    |      Owner:  blair
      Type:  update         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:  fixed          |   Keywords:  haspatch
      Port:  protobuf3-cpp  |
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Comment (by raimue):

 As there was no reaction from the maintainer for months on any of the
 duplicate tickets, I just updated these ports to current version 3.4.0.

 See #54628 for the compilation failure of protobuf3-java.

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Ticket URL: <https://trac.macports.org/ticket/54136#comment:5>
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