Update mvn hash
Update mvn hash

heroku/heroku-buildpack-java,JIoJIaJIu/heroku-buildpack-java,Scalingo/java-buildpack,wishtack/heroku-buildpack-java,Scalingo/java-buildpack,heroku/heroku-buildpack-java,wishtack/heroku-buildpack-java,JIoJIaJIu/heroku-buildpack-java