Adjust Jenkinsfile for move of releng.aggregator to github Change-Id: I69ac70dd0e64db363fb70962f8aad97ca0c666a8 Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui.tools/+/190630 Tested-by: Platform Bot <platform-bot@eclipse.org> Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>