Update build configuration for next release cycle (2021-09)

Change-Id: I3add604ffafb8a16026baa44c24a46080bb4338f
Signed-off-by: Frederic Gurr <frederic.gurr@eclipse-foundation.org>
diff --git a/Jenkinsfile b/Jenkinsfile
index 86f9a21..cc1944d 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -14,7 +14,7 @@
         timestamps ()
     }
     environment {
-        TRAIN_NAME = "2021-06"
+        TRAIN_NAME = "2021-09"
         STAGING_DIR = "/home/data/httpd/download.eclipse.org/staging/${TRAIN_NAME}"
     }
     stages {
diff --git a/pom.xml b/pom.xml
index 1f8d2e7..2bd0a1c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,9 +7,9 @@
   <packaging>pom</packaging>
   <properties>
     <tycho-version>2.0.0</tycho-version>
-    <trainName>2021-06</trainName>
-    <referenceRepo>releases/2021-03/202103171000</referenceRepo>
-    <eclipse.repo.url>https://download.eclipse.org/eclipse/updates/4.19/R-4.19-202103031800</eclipse.repo.url>
+    <trainName>2021-09</trainName>
+    <referenceRepo>releases/2021-06/202106161001</referenceRepo>
+    <eclipse.repo.url>https://download.eclipse.org/eclipse/updates/4.20/R-4.20-202106111600</eclipse.repo.url>
     <simrel.aggregator.repo.url>https://download.eclipse.org/cbi/updates/aggregator/headless/4.13/</simrel.aggregator.repo.url>
     <cbi.analyzers.repo.url>https://download.eclipse.org/cbi/updates/analyzers/4.7</cbi.analyzers.repo.url>
   </properties>
diff --git a/simrel.aggr b/simrel.aggr
index aa0f57d..d94be5a 100644
--- a/simrel.aggr
+++ b/simrel.aggr
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="ASCII"?>
-<aggregator:Aggregation xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:aggregator="http://www.eclipse.org/cbi/p2repo/2011/aggregator/1.1.0" description="Aggregation files used for Simultaneous Release (yearly &quot;release train&quot;)." buildmaster="//@contacts[email='frederic.gurr@eclipse.org']" label="2021-06" buildRoot="buildresultsPhoton" packedStrategy="UNPACK_AS_SIBLING" sendmail="true" type="I" allowLegacySites="false">
+<aggregator:Aggregation xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:aggregator="http://www.eclipse.org/cbi/p2repo/2011/aggregator/1.1.0" description="Aggregation files used for Simultaneous Release (yearly &quot;release train&quot;)." buildmaster="//@contacts[email='frederic.gurr@eclipse.org']" label="2021-09" buildRoot="buildresultsPhoton" packedStrategy="UNPACK_AS_SIBLING" sendmail="true" type="I" allowLegacySites="false">
   <validationSets label="main">
     <contributions href="orbit.aggrcon#/"/>
     <contributions href="equinox.aggrcon#/"/>