remove usage of deprecated Role into Export

src/Bundle/ChillReportBundle/Export/Export/ReportList.php

@@ -458,9 +458,9 @@ class ReportList implements ExportElementValidatedInterface, ListInterface
             ->setParameter('authorized_centers', $centers);
     }
 
-    public function requiredRole()
+    public function requiredRole(): string
     {
-        return new Role(ReportVoter::LISTS);
+        return ReportVoter::LISTS;
     }
 
     public function supportsModifiers()

src/Bundle/ChillReportBundle/Export/Filter/ReportDateFilter.php

@@ -18,7 +18,7 @@ use Doctrine\ORM\Query\Expr;
 
 class ReportDateFilter implements FilterInterface
 {
-    public function addRole()
+    public function addRole(): ?string
     {
         return null;
     }