WordPress Cluster 9.0.71

• Themes updated:
  • Blocks 2.6.8
    • Improved nav bar item spacing
    • Removed Sailthru Horizon theme support
  • The Courier 4.2.12
    • CSS fixes
  • Press and Journal 4.2.9
    • CSS fixes

PR: https://github.com/dc-thomson/wordpress/pull/2621