Update parent-pom, run with Java 8, ci build on 2.0.0-X branch

[stbischof]

• jboss-parent from 16 to 39
• rm maven-enforcer-plugin with
  • requireMavenVersion >2.2.0
  • requireJavaVersion 1.5.0
• rm java5 surefire test
• fix checkstyle in code and xml
• add dependabot
• add ci build

[stbischof]

@petrberan please review and merge. for ci see: https://github.com/stbischof/descriptors/actions/runs/9254616132/job/25456760930