fix: add aria-live='assertive' to LoginForm submit error (#3874)

Author: Nixxx19

client/modules/User/components/LoginForm.tsx

@@ -105,7 +105,7 @@ export function LoginForm() {
               )}
             </Field>
             {submitError && !modifiedSinceLastSubmit && (
-              <span className="form-error">
+              <span className="form-error" aria-live="assertive">
                 {t('LoginForm.Errors.invalidCredentials')}
               </span>
             )}