PHP 8.3 support

Updates:

• Drop PHP 8.0 support #489 (@jakzal)
• Add support for PHP 8.3 #493 (@dkarlovi @jakzal)
  • Exclude phpda and phpspec on PHP 8.3 0417120
  • Exclude twigcs on PHP 8.3 c66dc68
  • Remove phpda since it does not work on any of the supported PHP versions c0a2d20

Internal:

• Replace prophecy with phpunit's built-in test doubles #488 (@jakzal)
• Update PHPUnit (9.x -> 10.x) #490 (@jakzal)