Changes

releng: use org.yaml.snakeyaml from orbit in e4.20 target

This needed after upgrading to Tycho 4.0.3.

Change-Id: Id8ed2e3c7f6a2066515f817bafe99004ab91244a
Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/205555
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>