Version bumps for 4.21

Needed by
https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/172237

Change-Id: If194f8dd861a957714967a87e8036a6275e9ae47
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.debug/+/183215
Tested-by: Platform Bot <platform-bot@eclipse.org>
1 file changed