[HOPSWORKS-3174] Bump-up RonDB version to 21.04.6
[HOPSWORKS-3174] Bump-up RonDB version to 21.04.6

hopshadoop/hops,hopshadoop/hops,hopshadoop/hops,hopshadoop/hops,hopshadoop/hops,hopshadoop/hops,hopshadoop/hops,hopshadoop/hops