Merge branch '5.4' into 6.0

* 5.4:
  Allow Symfony 6

Author: derrabus

composer.json

@@ -28,7 +28,7 @@
         "symfony/deprecation-contracts": "^2.1"
     },
     "require-dev": {
-        "symfony/filesystem": "^4.4|^5.0"
+        "symfony/filesystem": "^4.4|^5.0|^6.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Intl\\": "" },