Adjust Jenkinsfile for move of releng.aggregator to github

Change-Id: Iffd1826bbb8349625cf132ab8692958143e5ec92
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.resources/+/190633
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
1 file changed