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/var-dumper/Caster/PgSqlCaster.php

@@ -69,6 +69,9 @@ class PgSqlCaster
         'function' => \PGSQL_DIAG_SOURCE_FUNCTION,
     ];
 
+    /**
+     * @return array
+     */
     public static function castLargeObject($lo, array $a, Stub $stub, bool $isNested)
     {
         $a['seek position'] = pg_lo_tell($lo);
@@ -76,6 +79,9 @@ class PgSqlCaster
         return $a;
     }
 
+    /**
+     * @return array
+     */
     public static function castLink($link, array $a, Stub $stub, bool $isNested)
     {
         $a['status'] = pg_connection_status($link);
@@ -108,6 +114,9 @@ class PgSqlCaster
         return $a;
     }
 
+    /**
+     * @return array
+     */
     public static function castResult($result, array $a, Stub $stub, bool $isNested)
     {
         $a['num rows'] = pg_num_rows($result);