Adjust Jenkinsfile for move of releng.aggregator to github

Change-Id: Ib97ad7778c3a412c6f8e31e3a87990ace632c482
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.text/+/190640
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
1 file changed