Bump maven-compiler-plugin from 3.3 to 3.8.1
Bump maven-compiler-plugin from 3.3 to 3.8.1

Bumps [maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin) from 3.3 to 3.8.1.
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](https://github.com/apache/maven-compiler-plugin/compare/maven-compiler-plugin-3.3...maven-compiler-plugin-3.8.1)
Jasig/inspektr,apereo/inspektr