Changes

incubator: Point update site to stable-9.0

Change-Id: I07031fb2cbb7cde5db96d7839a3bba911bd9a276
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/202315
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>