Use final release URL of Eclipse Platform

Change-Id: I8d94f9700bc114de6e56b13da318c5f233b9e4ac
Signed-off-by: Markus Knauer <mknauer@eclipsesource.com>
diff --git a/releng/org.eclipse.rap.build/pom.xml b/releng/org.eclipse.rap.build/pom.xml
index 0f36059..40ce66e 100644
--- a/releng/org.eclipse.rap.build/pom.xml
+++ b/releng/org.eclipse.rap.build/pom.xml
@@ -29,7 +29,7 @@
      -->
     <jetty-repo.url>https://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.37.v20210219/</jetty-repo.url>
     <orbit-repo.url>https://download.eclipse.org/tools/orbit/downloads/2021-03/</orbit-repo.url>
-    <platform-repo.url>https://download.eclipse.org/eclipse/updates/4.19-I-builds/I20210303-1800/</platform-repo.url>
+    <platform-repo.url>https://download.eclipse.org/eclipse/updates/4.19/R-4.19-202103031800/</platform-repo.url>
     <rap-extra-repo.url>https://download.eclipse.org/rt/rap/base-platforms/3.14/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. -->