Default Tomcat version is now 9.0.30

Change effective on 08 January 2020

The default version of Apache Tomcat used to run Java WAR files deployed with the Heroku CLI has been upgraded to version 9.0.30.

For more information on using the Heroku CLI support for WAR deployment, see the Dev Center guide to Configuring WAR Deployment with the Heroku CLI. For more information on this version of Tomcat, see the official Apache Tomcat documentation.