Bug 573962 - Update product version number to 4.21 across build script

Change-Id: I78c54c8c07bf1d4ace40a3728dcf79db114b877f
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/181368
diff --git a/releng/org.eclipse.ui.releng/platformUiTools.p2f b/releng/org.eclipse.ui.releng/platformUiTools.p2f
index bbb8f75..eeee903 100644
--- a/releng/org.eclipse.ui.releng/platformUiTools.p2f
+++ b/releng/org.eclipse.ui.releng/platformUiTools.p2f
@@ -259,12 +259,12 @@
     </iu>
     <iu id='org.eclipse.swt.tools.feature.feature.group' name='SWT Tools' version='0.0.0'>
         <repositories size='1'>
-            <repository location='https://download.eclipse.org/eclipse/updates/4.20-I-builds'/>
+            <repository location='https://download.eclipse.org/eclipse/updates/4.21-I-builds'/>
         </repositories>
     </iu>
     <iu id='org.eclipse.equinox.executable.feature.group' name='Eclipse platform launcher executables' version='0.0.0'>
         <repositories size='1'>
-            <repository location='https://download.eclipse.org/eclipse/updates/4.20-I-builds'/>
+            <repository location='https://download.eclipse.org/eclipse/updates/4.21-I-builds'/>
         </repositories>
     </iu>
   </ius>