set max age of doi form element to 0

src/Form/RoblibIllLoanForm.php

@@ -173,6 +173,9 @@ class RoblibIllLoanForm extends FormBase {
           ':input[name="Genre"]' => ['value' => 'book'],
         ],
       ],
+      '#cache' => [
+        'max-age' => 0,
+      ],
       '#required' => FALSE,
     ];
     $form['doi_button'] = [