Changes

releng: Upgrade to Tycho 4.0.3

Update pom.xml files accordingly

It requires maven 3.9.x

Remove org.javassit from target since it's not needed.
Get org.yaml.snakeyaml from orbit.

Change-Id: I9a9523e0b8a2725c294575375fc0b206343f9791
Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/205533
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>