releng, skeleton: Align test-traces w/ latest v1.9

Commit b5ead38 did it for the tracecompass-incubator-master.target
file already. Apply the same change consistently in the skeleton too.

Change-Id: I5c07b551b309ac0335450ed9918773f87b784ba6
Signed-off-by: Marco Miller <marco.miller@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/196307
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>

skeleton/skeleton.rcp/skeleton.tracecompass.target/skeleton.tracecompass.target

@@ -177,7 +177,7 @@
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.tracecompass.testtraces.tracecompass-test-traces-ctf" version="0.0.0"/>
 <unit id="org.eclipse.tracecompass.testtraces.tracecompass-test-traces-ftrace" version="0.0.0"/>
-<repository location="https://archive.eclipse.org/tracecompass/tracecompass-test-traces/repository/1.8.0/"/>
+<repository location="https://archive.eclipse.org/tracecompass/tracecompass-test-traces/repository/1.9.0/"/>
 </location>
     <location includeDependencyScope="provided" includeSource="true" missingManifest="generate" type="Maven">
         <dependencies>