Fix tests

Author: dunglas

composer.json

@@ -78,7 +78,7 @@
         "symfony/phpunit-bridge": "^4.3.1",
         "symfony/routing": "^3.4 || ^4.0",
         "symfony/security-bundle": "^3.4 || ^4.0",
-        "symfony/security-core": "^3.4 || ^4.0",
+        "symfony/security-core": "^4.3",
         "symfony/twig-bundle": "^3.4 || ^4.0",
         "symfony/validator": "^3.4 || ^4.0",
         "symfony/web-profiler-bundle": "^4.2",