Update version references from 3 to 4

- composer.json docs URL
- English and French index.rst

Author: dereuromark

composer.json

@@ -20,7 +20,7 @@
         "issues": "https://github.com/cakephp/authentication/issues",
         "forum": "https://discourse.cakephp.org/",
         "source": "https://github.com/cakephp/authentication",
-        "docs": "https://book.cakephp.org/authentication/3/en/"
+        "docs": "https://book.cakephp.org/authentication/4/en/"
     },
     "require": {
         "php": ">=8.1",

docs/en/index.rst

@@ -8,7 +8,7 @@ Project's ROOT directory (where the **composer.json** file is located)
 
     php composer.phar require cakephp/authentication
 
-Version 3 of the Authentication Plugin is compatible with CakePHP 5.
+Version 4 of the Authentication Plugin is compatible with CakePHP 5.
 
 Load the plugin by adding the following statement in your project's ``src/Application.php``::
 

docs/fr/index.rst

@@ -9,7 +9,7 @@ répertoire ROOT de votre projet CakePHP (là où se trouve le fichier
 
     php composer.phar require cakephp/authentication
 
-La version 3 du Plugin Authentication est compatible avec CakePHP 5.
+La version 4 du Plugin Authentication est compatible avec CakePHP 5.
 
 Chargez le plugin en ajoutant l'instruction suivante dans le fichier
 ``src/Application.php`` de votre projet::