remove usage of deprecated Role into Export

src/Bundle/ChillMainBundle/Export/ExportInterface.php

@@ -139,10 +139,8 @@ interface ExportInterface extends ExportElementInterface
 
     /**
      * Return the required Role to execute the Export.
-     *
-     * @return \Symfony\Component\Security\Core\Role\Role
      */
-    public function requiredRole();
+    public function requiredRole(): string;
 
     /**
      * Inform which ModifiersInterface (i.e. AggregatorInterface, FilterInterface)

src/Bundle/ChillMainBundle/Export/ExportManager.php

@@ -550,7 +550,7 @@ class ExportManager
         if (null === $centers) {
             $centers = $this->authorizationHelper->getReachableCenters(
                 $this->user,
-                $role->getRole(),
+                $role
             );
         }
 

src/Bundle/ChillMainBundle/Export/ModifierInterface.php

@@ -26,9 +26,9 @@ interface ModifierInterface extends ExportElementInterface
      * If null, will used the ExportInterface::requiredRole role from
      * the current executing export.
      *
-     * @return \Symfony\Component\Security\Core\Role\Role|null A role required to execute this ModifiersInterface
+     * @return string|null A role required to execute this ModifiersInterface
      */
-    public function addRole();
+    public function addRole(): ?string;
 
     /**
      * Alter the query initiated by the export, to add the required statements