Require maven-3.8.3

Update odlparent dependencies and enforcer configuration to require maven-3.8.2 or later.

This both a security as well as functionality change release:

https://maven.apache.org/docs/3.8.1/release-notes.html

https://maven.apache.org/docs/3.8.2/release-notes.html

Most significantly, though, this will help plugin developers with dependencies.