composer: Allow phpunit-bridge 7

Author: jtojnar

composer.json

@@ -20,7 +20,7 @@
         "php": ">=7.2.5"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "^6.2",
+        "symfony/phpunit-bridge": "^6.2 || ^7.0",
         "phpstan/phpstan": "^1.12",
         "friendsofphp/php-cs-fixer": "^3.4"
     },