XDOCKER-175: Upgrade stable version to 13.0

13/mysql-tomcat/.env

13/mysql-tomcat/Dockerfile

13/mysql-tomcat/docker-compose.yml

13/mysql-tomcat/mysql/init.sql

13/mysql-tomcat/mysql/xwiki.cnf

13/mysql-tomcat/tomcat/setenv.sh

13/mysql-tomcat/xwiki/docker-entrypoint.sh

13/mysql-tomcat/xwiki/hibernate.cfg.xml

13/postgres-tomcat/.env

13/postgres-tomcat/Dockerfile

13/postgres-tomcat/docker-compose.yml

13/postgres-tomcat/tomcat/setenv.sh

13/postgres-tomcat/xwiki/docker-entrypoint.sh

13/postgres-tomcat/xwiki/hibernate.cfg.xml

build.gradle