Remove dead annotation

modules/saml/www/sp/saml2-acs.php

@@ -69,7 +69,7 @@ $issuer = $issuer->getValue();
 
 $session = Session::getSessionFromRequest();
 $prevAuth = $session->getAuthData($sourceId, 'saml:sp:prevAuth');
-/** @psalm-var string $issuer */
+
 if ($prevAuth !== null && $prevAuth['id'] === $response->getId() && $prevAuth['issuer'] === $issuer) {
     /* OK, it looks like this message has the same issuer
      * and ID as the SP session we already have active. We