Set requirement to Symfony 5.4 and fix phpstan issue

UserInterface/Controller/Admin/ArticleController.php

@@ -210,7 +210,7 @@ private function getLocale(Request $request): string
         return $request->query->getAlnum('locale', $request->getLocale());
     }
 
-    private function handleAction(Request $request, string $uuid): ?ArticleInterface
+    private function handleAction(Request $request, string $uuid): ?ArticleInterface // @phpstan-ignore-line
     {
         $action = $request->query->get('action');
 

composer.json

@@ -27,11 +27,11 @@
         "jms/serializer": "^3.3",
         "jms/serializer-bundle": "^3.3 || ^4.0",
         "ramsey/uuid": "^3.1 || ^4.0",
-        "sulu/sulu": "~2.4.13 || ^2.5.9@dev",
-        "symfony/config": "^4.3 || ^5.0 || ^6.0",
-        "symfony/dependency-injection": "^4.3 || ^5.0 || ^6.0",
-        "symfony/http-foundation": "^4.3 || ^5.0 || ^6.0",
-        "symfony/http-kernel": "^4.3 || ^5.0 || ^6.0",
+        "sulu/sulu": "^2.5.0 || ^2.5@dev",
+        "symfony/config": "^5.4 || ^6.0",
+        "symfony/dependency-injection": "^5.4 || ^6.0",
+        "symfony/http-foundation": "^5.4 || ^6.0",
+        "symfony/http-kernel": "^5.4 || ^6.0",
         "symfony-cmf/slugifier-api": "^1.0 || ^2.0",
         "twig/twig": "^1.41 || ^2.0 || ^3.0"
     },
@@ -58,12 +58,12 @@
         "sulu/content-bundle": "^0.7 || 0.*@dev",
         "sulu/headless-bundle": "^0.8 || ^0.9 || ^0.10@dev",
         "sulu/messenger": "^0.1 || 0.*@dev",
-        "symfony/browser-kit": "^4.3 || ^5.0 || ^6.0",
-        "symfony/dotenv": "^4.3 || ^5.0 || ^6.0",
-        "symfony/framework-bundle": "^4.3 || ^5.0 || ^6.0",
+        "symfony/browser-kit": "^5.4 || ^6.0",
+        "symfony/dotenv": "^5.4 || ^6.0",
+        "symfony/framework-bundle": "^5.4 || ^6.0",
         "symfony/monolog-bundle": "^3.1",
-        "symfony/security-bundle": "^4.3 || ^5.0 || ^6.0",
-        "symfony/stopwatch": "^4.3 || ^5.0 || ^6.0"
+        "symfony/security-bundle": "^5.4 || ^6.0",
+        "symfony/stopwatch": "^5.4 || ^6.0"
     },
     "conflict": {
         "guzzlehttp/ringphp": "<1.1.1",