Fix stale repositories

Fix stale repositories

- update camunda repo urls to point to new location
- this gets rid of dependency resolution warning log lines
- remove sca-maven-plugin declaration since it is a propriatary
  plugin that is not publicly available (in the repos that we have configured)
  which results in dependency resolution warning log lines too

Issue-ID: SO-4264
Change-Id: I59a6367f30ea4d3eee55882a7d7ba94d3067e9dd
Signed-off-by: Fiete Ostkamp <fiete.ostkamp@telekom.de>