Set a non-dev version for the bundle tester

Author: lgeorget

composer.json

@@ -17,7 +17,7 @@
         "php-http/mock-client": "^1.5",
         "nyholm/psr7": "^1.3",
         "symfony/phpunit-bridge": "^6.4|^7.0",
-        "nyholm/symfony-bundle-test": "2.0.x-dev",
+        "nyholm/symfony-bundle-test": "^3.0",
         "matthiasnoback/symfony-dependency-injection-test": "^5.0",
         "symfony/panther": "^2.0",
         "symfony/browser-kit": "^6.4|^7.0",