Update composer

Author: dantleech

composer.json

@@ -10,7 +10,7 @@
     ],
     "require": {
         "php": "^7.3 || ^8.0",
-        "symfony/filesystem": "^4.2 || ^5.0"
+        "symfony/filesystem": "^4.2 || ^5.0 || ^6.0 || ^7.0"
     },
     "require-dev": {
         "dms/phpunit-arraysubset-asserts": "dev-master",