[6.4] Allow 7.0 deps

Author: nicolas-grekas

composer.json

@@ -20,7 +20,7 @@
         "symfony/polyfill-ctype": "^1.8"
     },
     "require-dev": {
-        "symfony/console": "^5.4|^6.0"
+        "symfony/console": "^5.4|^6.0|^7.0"
     },
     "conflict": {
         "symfony/console": "<5.4"