Bump ParaView to v5.6.0.
Now that ParaView 5.6.0 has been released, require it for SMTK 3 and CMB 6.
A Gitlab security update will be applied on March 29th, between 8am and 10am, EST (UTC-05:00). This site may have intermittent delays during that time.
Now that ParaView 5.6.0 has been released, require it for SMTK 3 and CMB 6.