GitLab

- Upgraded Maven parent project to 8.0.0
- As part of Java 11 migration, upgraded JAXB (Jakarta XML Bining) to v2.3.3
- Upgraded authzforce-ce-core-pdp-api to v18.0.0
- Fixed CVE on jackson-databind -> v2.9.10.8
- Upgraded authzforce-ce-xacml-json-model: 3.0.0
- Replaced findbugs maven plugin with spotbugs
- updated license headers for year 2021