v3.0.0-rc.6 UI Refresh

Release notes:

• Updated recommended minimum and required PHP versions
• Added PHP 8.3 CI build target
• Updated for PHP dynamic property deprecation (#427)
• Merged fixes from hotfix-3-0-0-rc-5:
  • Fixed PHP 8 regression (#426)
  • Updated show delete semantics (#425)
  • Enhanced zootopia playlist capture
  • Finessed DJ sort
  • Finessed Discogs search