DX: allow Symfony ^7 (#8)

Author: keradus

composer.json

@@ -11,13 +11,13 @@
     ],
     "require": {
         "php": "^7.1.3 || ^8.0",
-        "symfony/process": "^4.4 || ^5 || ^6"
+        "symfony/process": "^4.4 || ^5 || ^6 || ^7"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.1",
         "maglnet/composer-require-checker": "^2 || ^3",
         "phpunit/phpunit": "^7.5.20 || ^8.5.14 || ^9.5",
-        "symfony/phpunit-bridge": "^5.3.7 || ^6"
+        "symfony/phpunit-bridge": "^5.3.7 || ^6 || ^7"
     },
     "config": {
         "optimize-autoloader": true,