Prepare for 2026-03 RC2

- Use https://download.eclipse.org/releases/2026-03/202603111000/
- Update splash screen instructions with links for the next cycle.

Part of #426

Author: merks

packages/org.eclipse.epp.package.common/splash/INSTRUCTIONS.md

@@ -22,6 +22,7 @@ and the 4 variations for each quarterly release (202x-06, 202x-09, 202x-12, 202(
 - For 2023-06 -> 2024-03 see [Helpdesk 2335](https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/2336)
 - For 2024-06 -> 2025-03 see [Helpdesk 3963](https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/3963)
 - For 2025-06 -> 2026-03 see [Helpdesk 5332](https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/5332) - [Eclipse_IDE.zip](https://gitlab.eclipse.org/-/project/23/uploads/b449ea9c813e964d3fe480727630d651/Eclipse_IDE.zip)
+- For 2026-06 -> 2027-03 see [Helpdesk 6906](https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/6906) - [Eclipse_IDE.zip](https://gitlab.eclipse.org/-/project/23/uploads/79a312193ad7b6b30c45816e31250138/Eclipse_IDE-_452x302.zip)
 
 ### Copy splash screen series into `org.eclipse.epp.package.common/splash/`
 

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

@@ -41,7 +41,7 @@
     <!-- Name release directory on download.eclipse.org -->
     <RELEASE_DIR>202603051000</RELEASE_DIR>
     <!-- SimRel Repo to build from -->
-    <SIMREL_REPO>https://download.eclipse.org/staging/2026-03/</SIMREL_REPO>
+    <SIMREL_REPO>https://download.eclipse.org/releases/2026-03/202603111000/</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) -->