releng: Build with tracecompass-e4.28 target by default

Signed-off-by: Patrick Tasse <patrick.tasse@gmail.com>
Change-Id: Idbfff22c895400871dcab3d7f8e574bbd2aae1ce
Reviewed-on: https://git.eclipse.org/r/c/tracecompass/org.eclipse.tracecompass/+/201630
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

pom.xml

@@ -57,7 +57,7 @@
     <tycho-use-project-settings>true</tycho-use-project-settings>
     <tycho.scmUrl>scm:git:git://git.eclipse.org/gitroot/tracecompass/org.eclipse.tracecompass.git</tycho.scmUrl>
     <cbi-plugins.version>1.3.2</cbi-plugins.version>
-    <target-platform>tracecompass-e4.27</target-platform>
+    <target-platform>tracecompass-e4.28</target-platform>
     <help-docs-eclipserun-repo>http://download.eclipse.org/eclipse/updates/4.20</help-docs-eclipserun-repo>
 
     <rcptt-version>2.5.3</rcptt-version>