java: Fix pom.xml
java: Fix pom.xml

protobuf-java 3.11.2 does not exist
see: https://repo.maven.apache.org/maven2/com/google/protobuf/protobuf-java/

google/or-tools,google/or-tools,or-tools/or-tools,google/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,or-tools/or-tools