[MacPorts] #67767: protobuf3-cpp: update to the current release (3.23.4)

[MacPorts]

#67767: protobuf3-cpp: update to the current release (3.23.4)
--------------------------+---------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  protobuf3-cpp
--------------------------+---------------------------
 I wanted to update `grpc`, but it turned out that our pretty outdated
 `protobuf3-cpp` does not have some required headers. Updating is
 desirable.

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Ticket URL: <https://trac.macports.org/ticket/67767>
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