Platform 2.4+ and Tomcat

Apologies for adding a sort of retro-active release note, but this is an important reminder that for platform versions 2.4 and higher, we no longer support Tomcat 7. This is because in 2.4, we upgrade to Spring 5, which dropped support for Tomcat 7 and began requiring Servlet Spec 3.1 or higher. Running on Tomcat 7 appears to mostly work, but you will likely run into issues, and as Tomcat 7 reached its EOL on 31 March 2021, we would strongly advise not running it production, if that’s at all possible.