Merge branch '4.4' into 5.3

* 4.4:
  Update license.rst
  Fix method link to isCsrfTokenValid
  Fix link reference in Upgrading to Symfony Flex

Author: javiereguiluz

contributing/code/license.rst

@@ -5,7 +5,7 @@ Symfony Code License
 
 Symfony code is released under `the MIT license`_:
 
-Copyright (c) 2004-2020 Fabien Potencier
+Copyright (c) 2004-2021 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

security/csrf.rst

@@ -150,8 +150,8 @@ generate a CSRF token in the template and store it as a hidden form field:
     </form>
 
 Then, get the value of the CSRF token in the controller action and use the
-:method:`Symfony\\Bundle\\FrameworkBundle\\Controller\\AbstractController::isCsrfTokenValid`
-to check its validity::
+:method:`Symfony\\Bundle\\FrameworkBundle\\Controller\\ControllerTrait::isCsrfTokenValid`
+method to check its validity::
 
     use Symfony\Component\HttpFoundation\Request;
     use Symfony\Component\HttpFoundation\Response;