require php 8.3, update to codex 3, update to phpunit 12.4

Author: pavog

composer.json

@@ -10,12 +10,12 @@
         }
     ],
     "require": {
-        "php": ">=8.1.0",
+        "php": ">=8.3.0",
         "ext-json": "*",
-        "aternos/codex": "^2.2.0"
+        "aternos/codex": "^3.0.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.5"
+        "phpunit/phpunit": "^12.4"
     },
     "autoload": {
         "psr-4": {