Bump version for 4.21 Change-Id: I001deb183c3665c7e14e34ac5c08308b364a3f19 Signed-off-by: Andrey Loskutov <loskutov@gmx.de> Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.releng/+/181908 Tested-by: Platform Bot <platform-bot@eclipse.org>