Problem:

Due to the age of our installed tomcats (version 7) on our VMs, we are unable to update to the latest version of the hibernate-validation library that requires a more recent version of the javax.el-api library (version 3).

Acceptance Criteria:

Update hibernate-validator Library to version 6.x (6.2.3 in POM)
(Or, remove entirely and see if Spring will import the version it wants)
Test a bunch on prototype/local development.
Review POM and libraries related to the Tomcat 9 version we're using, such as our Servlet spec version.
Add a comment to POM re. "be careful" and keep alignment with Tomcat version (?)