Use SimRel staging repository again

Author: basilevs

releng/pom.xml

@@ -30,7 +30,7 @@
     <ajdt43repository>https://download.eclipse.org/rcptt/dependencies/ajdt/nightly/2.2/</ajdt43repository>
     <hookVersion>1.4.0.v20240213-1357</hookVersion>
     <signExcludeInnerJars>true</signExcludeInnerJars>
-    <eclipse-pde-repository>https://download.eclipse.org/releases/2026-06</eclipse-pde-repository>
+    <eclipse-pde-repository>https://download.eclipse.org/staging/2026-06</eclipse-pde-repository>
     <ecl-platform-repository>https://download.eclipse.org/releases/2021-12</ecl-platform-repository>
     <ecl.executionEnvironment>JavaSE-17</ecl.executionEnvironment> <!-- Should be compatible with ecl-platform-repository -->
     <aspectj_version>1.14.0</aspectj_version>