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>
2 files changed