[Bug] dubbo-maven-pluggin cannot successfully compile google.protobuf.Empty into 'void' keyword

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Apache Dubbo Component

Java SDK (apache/dubbo)

Dubbo Version

dubbo Version:3.3.5 dubbo-maven-pluggin version:3.3.5

Steps to reproduce this issue

issue discription : i use protobuf development style of triple protocal of dubbo 3.3.5 ,i build a new maven project to manage proto file and compiled java source code, finnally commit it to my local maven repsitory so that i can make full use of the compiled code.but when i define rpc service 'rpc xx (XXModel) returns (google.protobuf.Empty)' ,and then dubbo-maven-pluggin compile,after serval times checked it gengeate 'public xx(XXModel)' left void 'keyWord'

so it possible caused by dubbo-maven-pluggin

What you expected to happen

the void keyword appear successfully!!!

Anything else

No response

Are you willing to submit a pull request to fix on your own?

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