v20.0.1.0

• Upgrade to Cumulus v20.0.1
• NOTE This version of Cumulus fixes bugs as mentioned in the release notes
• Remove figlet and banner from the Making ... banner.
• Remove unused providers null and archive and bump pinned version of null
  in daac module.
• Add variables to rds module:
  • cluster_instance_count
  • lambda_memory_sizes
  • lambda_timeouts
  • max_capacity
  • min_capacity