Update build configuration for RAP Runtime 3.12.0 M3

- Use Eclipse Platform build S-4.15M3-202002191800

Change-Id: Id883020d16417b07e3826abc991c2b1e9a2be4b6
Signed-off-by: Markus Knauer <mknauer@eclipsesource.com>
diff --git a/features/org.eclipse.rap.e4.equinox.target.feature/.forceQualifierUpdate b/features/org.eclipse.rap.e4.equinox.target.feature/.forceQualifierUpdate
index f88293e..b6116ca 100644
--- a/features/org.eclipse.rap.e4.equinox.target.feature/.forceQualifierUpdate
+++ b/features/org.eclipse.rap.e4.equinox.target.feature/.forceQualifierUpdate
@@ -1 +1 @@
-2020-02-05T12:00:00+00:00
+2020-02-26T12:00:00+00:00
diff --git a/features/org.eclipse.rap.equinox.target.feature/.forceQualifierUpdate b/features/org.eclipse.rap.equinox.target.feature/.forceQualifierUpdate
index f88293e..b6116ca 100644
--- a/features/org.eclipse.rap.equinox.target.feature/.forceQualifierUpdate
+++ b/features/org.eclipse.rap.equinox.target.feature/.forceQualifierUpdate
@@ -1 +1 @@
-2020-02-05T12:00:00+00:00
+2020-02-26T12:00:00+00:00
diff --git a/releng/org.eclipse.rap.build/pom.xml b/releng/org.eclipse.rap.build/pom.xml
index 25878cb..a25d020 100644
--- a/releng/org.eclipse.rap.build/pom.xml
+++ b/releng/org.eclipse.rap.build/pom.xml
@@ -31,7 +31,7 @@
     <cbi-plugins.version>1.1.2</cbi-plugins.version>
     <jetty-repo.url>https://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.26.v20200117/</jetty-repo.url>
     <orbit-repo.url>https://download.eclipse.org/tools/orbit/downloads/2020-03/</orbit-repo.url>
-    <platform-repo.url>https://download.eclipse.org/eclipse/updates/4.15-I-builds/I20200129-1800/</platform-repo.url>
+    <platform-repo.url>https://download.eclipse.org/eclipse/updates/4.15milestones/S-4.15M3-202002191800/</platform-repo.url>
     <rap-extra-repo.url>https://build.eclipse.org/rt/rap/base-platforms/3.12/extra-dependencies/</rap-extra-repo.url>
     <license-repo.url>https://download.eclipse.org/cbi/updates/license/</license-repo.url>
     <!-- The build type, N for nighty builds, S for stable builds. S-builds will be signed. -->