19.12-RC7

Changes compared to: 19.12-RC6

Non user facing:

• Fixes a non released bug where premium would give a fatal error on the redirect page when the version was lower than 19.16. #19345
• Refactors WPSEO_Admin_Bar_Menu to accept WPSEO_Shortlinker as a constructor parameter. #19342
• Adds data attributes to the admin bar and plugins page premium links. #19341