Update reference repository to 2020-12 M1 release.

Change-Id: I936e899b960c34a32c651eea71738faa86bf66d9
diff --git a/releng/mavenparent/pom.xml b/releng/mavenparent/pom.xml
index 742abbc..c732850 100644
--- a/releng/mavenparent/pom.xml
+++ b/releng/mavenparent/pom.xml
@@ -88,8 +88,8 @@
     <buildId>${buildType}${buildTimestamp}</buildId>
     <buildLabel>${buildType}-${buildId}-${buildTimestamp}</buildLabel>
 
-    <!-- Reference repository for the report, and for content baseline Orbit 2020-09 Contribution -->
-    <referenceRepoBuild>R20200831200620</referenceRepoBuild>
+    <!-- Reference repository for the report, and for content baseline Orbit 2020-12 M1 Contribution -->
+    <referenceRepoBuild>S20201005193535</referenceRepoBuild>
 
     <!-- Reference repository for the old-style Orbit R-build from CVS -->
     <orbitOldRBuild>R20190726180751</orbitOldRBuild>
@@ -143,7 +143,7 @@
     <!-- some bundles might depend on base platform content -->
     <repository>
       <id>eclipse-platform</id>
-      <url>https://download.eclipse.org/eclipse/updates/4.15/</url>
+      <url>https://download.eclipse.org/eclipse/updates/4.18milestones/</url>
       <layout>p2</layout>
     </repository>
   </repositories>