[MacPorts] #62585: protobuf3-cpp: update to 3.15.6

[MacPorts]

#62585: protobuf3-cpp: update to 3.15.6
----------------------------+--------------------
  Reporter:  Javabien       |      Owner:  (none)
      Type:  update         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:  fixed          |   Keywords:
      Port:  protobuf3-cpp  |
----------------------------+--------------------
Changes (by reneeotten):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 current version in MacPorts is: protobuf3-cpp @3.17.0

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Ticket URL: <https://trac.macports.org/ticket/62585#comment:4>
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