Version bump for 4.21 Change-Id: I212777bf6e2f1b1e5707b1ba536cfca3d2bc6a4d Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.common/+/183834 Tested-by: Alexander Kurtakov <akurtako@redhat.com> Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>