Specify PHP version requirement

Author: emodric

composer.json

@@ -8,8 +8,11 @@
             "homepage": "https://netgen.io"
         }
     ],
+    "require": {
+        "php": "^8.4"
+    },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.90",
+        "friendsofphp/php-cs-fixer": "^3.91",
         "phpstan/phpstan": "^2.1",
         "phpstan/phpstan-strict-rules": "^2.0"
     },