Fix Psalm-issues

lib/SimpleSAML/SessionHandlerPHP.php

@@ -50,7 +50,7 @@ class SessionHandlerPHP extends SessionHandler
         $config = Configuration::getInstance();
         $this->cookie_name = $config->getString(
             'session.phpsession.cookiename',
-            ini_get('session.name') ?? 'PHPSESSID'
+            ini_get('session.name') ?: 'PHPSESSID'
         );
 
         if (session_status() === PHP_SESSION_ACTIVE) {

tests/lib/SimpleSAML/Utils/CryptoTest.php

@@ -33,6 +33,9 @@ class CryptoTest extends TestCase
     /** @var string */
     protected string $certdir;
 
+    /** @var \SimpleSAML\Configuration */
+    protected Configuration $config;
+
     /** @var \SimpleSAML\Utils\Crypto */
     protected $cryptoUtils;