Bug 573960 - POM and product version change for 4.21 release Change-Id: I199e28437596ac4f2baa4397531255b8011a960d Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com> Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt.binaries/+/181372