Rollback protobuf version to 3.5.1
### Motivation
Due to protobuf version conflicts and incompatibility issues, first roll back the protobuf version, and then resend a new pull request to fix this problem.
### Modifications
Rollback protobuf version to 3.5.1
@@ -123,8 +123,8 @@ flexible messaging model and an intuitive client API.</description>
<dockerfile-maven.version>1.4.13</dockerfile-maven.version>
<typetools.version>0.5.0</typetools.version>
<protobuf2.version>2.4.1</protobuf2.version>
- <protobuf3.version>3.11.4</protobuf3.version>
- <protoc3.version>3.11.4</protoc3.version>
+ <protobuf3.version>3.5.1</protobuf3.version>
+ <protoc3.version>3.5.1-1</protoc3.version>
<grpc.version>1.18.0</grpc.version>
<protoc-gen-grpc-java.version>1.12.0</protoc-gen-grpc-java.version>
<gson.version>2.8.2</gson.version>
