Fix security-core cross-dependencies, fixes #27507

Author: Stéphan Kochen

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.3.9",
-        "symfony/security-core": "^2.8.6",
+        "symfony/security-core": "^2.8.41",
         "symfony/event-dispatcher": "~2.1|~3.0.0",
         "symfony/http-foundation": "~2.4|~3.0.0",
         "symfony/http-kernel": "~2.4|~3.0.0",