Fix security-core cross-dependencies, fixes #27507

Author: Stéphan Kochen

composer.json

@@ -29,7 +29,7 @@
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/filesystem": "~2.3|~3.0.0",
         "symfony/routing": "^2.8.17",
-        "symfony/security-core": "~2.6.13|~2.7.9|~2.8|~3.0.0",
+        "symfony/security-core": "^2.8.41|^3.3.17",
         "symfony/security-csrf": "^2.8.31|^3.3.13",
         "symfony/stopwatch": "~2.3|~3.0.0",
         "symfony/templating": "~2.7|~3.0.0",