IBX-8470: Upgraded codebase to Symfony 6 (#1157)

Bumped PHP version to 8.3

Author: adamwojs

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": ">=8.3",
         "ibexa/experience": "~5.0.x-dev",
         "ibexa/cart": "~5.0.x-dev",
         "ibexa/checkout": "~5.0.x-dev",