update protobuf requirement to 3.6.0 for pip (#20331)
since protobuf dependence was update 3.6.0, there are incompatible problems on machines with 3.4.0 < protobuf version < 3.6.0
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since protobuf dependence was update 3.6.0, there are incompatible problems on machines with 3.4.0 < protobuf version < 3.6.0