N°6934 - Symfony 6.4 - upgrade Symfony bundles to 6.4 (#580)

* Update Symfony lib to version ~6.4.0
* Update code missing return type
* Add an iTop general configuration entry to store application secret (Symfony mandatory parameter)
* Use dependency injection in ExceptionListener & UserProvider classes

lib/symfony/dependency-injection/Loader/Configurator/AbstractConfigurator.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Loader\Configurator;
 
 use Symfony\Component\Config\Loader\ParamConfigurator;
+use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\DependencyInjection\Argument\AbstractArgument;
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
 use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
@@ -26,13 +27,16 @@ abstract class AbstractConfigurator
     public const FACTORY = 'unknown';
 
     /**
-     * @var callable(mixed, bool)|null
+     * @var \Closure(mixed, bool):mixed|null
      */
     public static $valuePreProcessor;
 
     /** @internal */
-    protected $definition;
+    protected Definition|Alias|null $definition = null;
 
+    /**
+     * @return mixed
+     */
     public function __call(string $method, array $args)
     {
         if (method_exists($this, 'set'.$method)) {
@@ -42,14 +46,14 @@ abstract class AbstractConfigurator
         throw new \BadMethodCallException(sprintf('Call to undefined method "%s::%s()".', static::class, $method));
     }
 
-    /**
-     * @return array
-     */
-    public function __sleep()
+    public function __sleep(): array
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
     }
 
+    /**
+     * @return void
+     */
     public function __wakeup()
     {
         throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
@@ -58,12 +62,11 @@ abstract class AbstractConfigurator
     /**
      * Checks that a value is valid, optionally replacing Definition and Reference configurators by their configure value.
      *
-     * @param mixed $value
-     * @param bool  $allowServices whether Definition and Reference are allowed; by default, only scalars and arrays are
+     * @param bool $allowServices whether Definition and Reference are allowed; by default, only scalars, arrays and enum are
      *
      * @return mixed the value, optionally cast to a Definition/Reference
      */
-    public static function processValue($value, $allowServices = false)
+    public static function processValue(mixed $value, bool $allowServices = false): mixed
     {
         if (\is_array($value)) {
             foreach ($value as $k => $v) {
@@ -101,6 +104,7 @@ abstract class AbstractConfigurator
         switch (true) {
             case null === $value:
             case \is_scalar($value):
+            case $value instanceof \UnitEnum:
                 return $value;
 
             case $value instanceof ArgumentInterface: