[6.4] Allow 7.0 deps

Author: nicolas-grekas

composer.json

@@ -21,10 +21,10 @@
     },
     "require-dev": {
         "composer/composer": "^1.0.2|^2.0",
-        "symfony/console": "^5.4|^6.0",
-        "symfony/dotenv": "^5.4|^6.0",
-        "symfony/http-foundation": "^5.4|^6.0",
-        "symfony/http-kernel": "^5.4|^6.0"
+        "symfony/console": "^5.4|^6.0|^7.0",
+        "symfony/dotenv": "^5.4|^6.0|^7.0",
+        "symfony/http-foundation": "^5.4|^6.0|^7.0",
+        "symfony/http-kernel": "^5.4|^6.0|^7.0"
     },
     "conflict": {
         "symfony/dotenv": "<5.4"