[releng] Use staging repo to build standalone debugger

Change-Id: I1f6c0f239c1a9d5beb32bbd7fb7d54242be163e1

pom.xml

diff --git a/pom.xml b/pom.xml
index ccb2f3e..a44a6c8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -25,7 +25,7 @@
 		<cbi-plugins.version>1.1.7</cbi-plugins.version>
 		<sonar.core.codeCoveragePlugin>jacoco</sonar.core.codeCoveragePlugin>
 		<cdt-site>http://ci.eclipse.org/cdt/job/cdt-master/lastSuccessfulBuild/artifact/releng/org.eclipse.cdt.repo/target/repository</cdt-site>
-		<simrel-site>https://download.eclipse.org/releases/2019-12</simrel-site>
+		<simrel-site>https://download.eclipse.org/staging/2019-12/</simrel-site>
 		<repo-path>tools/cdt/builds/master/nightly</repo-path>
 		<sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
 		<sonar.jacoco.reportPath>${project.basedir}/../../target/jacoco.exec</sonar.jacoco.reportPath>