This referendum updates Kusama Relay Chain and System Chains to their latest versions.
Kusama Asset Hub was not properly bumped to v1.3.3 in the v1.3.3 release, so upgrading the other chains was put off until this was released as part of the partial release in v1.3.4.
Therefore Kusama Asset Hub and Encointer are both updated directly to fellowship release v1.3.4, while the Relay Chain, Kusama Bridge Hub, People Chain and Coretime chain are all updated to fellowship release v1.3.3, their most recent version.