Version bump for 4.21

Needed by https://git.eclipse.org/r/c/equinox/rt.equinox.p2/+/182677

Change-Id: I627896d25d306b7d51786d051dbfcf3c1b8622eb
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.p2/+/183972
Tested-by: Equinox Bot <equinox-bot@eclipse.org>
2 files changed