Composer: allow symfony v6

Author: f3l1x

composer.json

@@ -28,7 +28,7 @@
     "phpstan/phpstan-deprecation-rules": "^1.0",
     "phpstan/phpstan-nette": "^1.0",
     "phpstan/phpstan-strict-rules": "^1.0",
-    "symfony/event-dispatcher": "^4.3.0 || ^5.0.0"
+    "symfony/event-dispatcher": "^4.3 || ^5.0 || ^6.0"
   },
   "autoload": {
     "psr-4": {