chore: Allow Symfony YAML 7 (#1159)

Author: theofidry

composer.json

@@ -25,7 +25,7 @@
         "myclabs/deep-copy": "^1.10",
         "sebastian/comparator": "^3.0 || ^4.0 || ^5.0",
         "symfony/property-access": "^6.4 || ^7.0",
-        "symfony/yaml": "^5.4 || ^6.0"
+        "symfony/yaml": "^6.0 || ^7.0"
     },
     "require-dev": {
         "bamarni/composer-bin-plugin": "^1.8.1",