fix compilation error in generated grpc code
fix compilation error in generated grpc code

bumped grpc version
added dependency on javax.annotation-api, missing in Java 9+

languagetool-org/languagetool,jimregan/languagetool,jimregan/languagetool,jimregan/languagetool,languagetool-org/languagetool,jimregan/languagetool,languagetool-org/languagetool,languagetool-org/languagetool,jimregan/languagetool,languagetool-org/languagetool