chore(maven): change to release-parent v2.4
chore(maven): change to release-parent v2.4

- change sonatype oss-parent to ours
- remove unnecessary configurations which are now provided through release-parent

related to #CAM-2727

filiphr/camunda-bpmn-model,nagyistoce/camunda-bpmn-model,camunda/camunda-bpmn-model