Adjust Jenkinsfile for move of releng.aggregator to github

Change-Id: I5b8c735b7794793d9b0eb9875fa80292f2f2f0cf
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.framework/+/190626
Tested-by: Equinox Bot <equinox-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>
1 file changed