Bug 573965 - Version bumps for 4.21 stream

Change-Id: Id93e6db0a64f6e6836674476938cb4e056d3d1da
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.team/+/181449
6 files changed