chore: fix deprecations in preparation uf upgrading to symfony 7.3

src/Controller/SecurityController.php

@@ -27,7 +27,7 @@ class SecurityController extends AbstractController
         // authentication (see App\EventListener\AuthorizationCodeListener).
         $session = $request->getSession();
         $targetPath = $session->get('_security.main.target_path');
-        if (str_contains($targetPath, '/authorize')) {
+        if (null !== $targetPath && str_contains($targetPath, '/authorize')) {
             $session->set('_oauth2', true);
         }