[6.4] Allow 7.0 deps

Author: nicolas-grekas

composer.json

@@ -21,9 +21,9 @@
     },
     "require-dev": {
         "ext-iconv": "*",
-        "symfony/console": "^5.4|^6.0",
-        "symfony/process": "^5.4|^6.0",
-        "symfony/uid": "^5.4|^6.0",
+        "symfony/console": "^5.4|^6.0|^7.0",
+        "symfony/process": "^5.4|^6.0|^7.0",
+        "symfony/uid": "^5.4|^6.0|^7.0",
         "twig/twig": "^2.13|^3.0.4"
     },
     "conflict": {