remove unused code

Author: EarthChen

dubbo-distribution/dubbo-all/pom.xml

@@ -514,7 +514,6 @@
                                     <include>org.apache.dubbo:dubbo-remoting-zookeeper-curator5</include>
                                     <include>org.apache.dubbo:dubbo-rpc-api</include>
                                     <include>org.apache.dubbo:dubbo-rpc-dubbo</include>
-<!--                                    <include>org.apache.dubbo:dubbo-rpc-grpc</include>-->
                                     <include>org.apache.dubbo:dubbo-rpc-injvm</include>
                                     <include>org.apache.dubbo:dubbo-rpc-rest</include>
                                     <include>org.apache.dubbo:dubbo-rpc-triple</include>