Latest version of com.google.protobuf:protoc
https://javadoc.io/doc/com.google.protobuf/protoc
Current version 21.0-rc-1
https://javadoc.io/doc/com.google.protobuf/protoc/21.0-rc-1
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.protobuf/protoc/21.0-rc-1/package-list