Add unit tests for security helper and provide composer.lock (#2058)

This change also includes change in phpstan baseline because new
phpstan version 1.6 was released

Author: tmotyl

.github/phpstan-baseline.neon

@@ -706,7 +706,7 @@ parameters:
 			path: ../app/code/core/Mage/Core/Model/Config/Data.php
 
 		-
-			message: "#^Cannot unset offset '@attributes' on array\\{\\000\\*\\000_parent\\: Varien_Simplexml_Element\\}\\.$#"
+			message: "#^Cannot unset offset '@attributes' on \\(array\\{\\}\\|array\\{\\000\\*\\000_parent\\: Varien_Simplexml_Element\\}\\)\\.$#"
 			count: 1
 			path: ../app/code/core/Mage/Core/Model/Layout.php
 

composer.json

@@ -46,6 +46,7 @@
   "extra": {
     "branch-alias": {
       "dev-main": "1.9.4.x-dev"
-    }
+    },
+    "magento-root-dir": "root"
   }
 }