Prepare for 2026-06 M2

- Use https://download.eclipse.org/releases/2026-06/202605011000/

Part of #436

Author: merks

releng/org.eclipse.epp.config/parent/pom.xml

@@ -41,7 +41,7 @@
     <!-- Name release directory on download.eclipse.org -->
     <RELEASE_DIR>202604301000</RELEASE_DIR>
     <!-- SimRel Repo to build from -->
-    <SIMREL_REPO>https://download.eclipse.org/staging/2026-06/</SIMREL_REPO>
+    <SIMREL_REPO>https://download.eclipse.org/releases/2026-06/202605011000/</SIMREL_REPO>
     <!-- ID used to generate the filename of the packages -->
     <eclipse.simultaneous.release.id>${RELEASE_NAME}-${RELEASE_MILESTONE}</eclipse.simultaneous.release.id>
     <!-- Timestamp used in various places, e.g. the about dialog (see about.mappings) -->