Version bump for 4.21 Needed by https://git.eclipse.org/r/c/platform/eclipse.platform.ua/+/173461 Change-Id: I9e5fb61476656d71139b2207daa5b920c45ca937 Signed-off-by: Alexander Kurtakov <akurtako@redhat.com> Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ua/+/183206 Tested-by: Platform Bot <platform-bot@eclipse.org>