Merge branch '3.4' into 4.2

* 3.4:
  [github] Implement the new security policy.
  [Finder] fix wrong method call casing
  Make tempfile path unique
  minor: fix phpdocs in the ldap component
  [Process] Fix infinite waiting for stopped process
  Use absolute URL for when the profiler's domain differs from the controller's domain which initialises the profiler.
  fix phpdoc
  [DI] fix using bindings with locators of service subscribers

Authorization/AccessDeniedHandlerInterface.php

@@ -26,7 +26,7 @@ interface AccessDeniedHandlerInterface
     /**
      * Handles an access denied failure.
      *
-     * @return Response may return null
+     * @return Response|null
      */
     public function handle(Request $request, AccessDeniedException $accessDeniedException);
 }