Fix version restriction

Author: tvdijen

composer.json

@@ -43,7 +43,7 @@
 
         "simplesamlphp/assert": "^1.9",
         "simplesamlphp/composer-module-installer": "^1.5",
-        "simplesamlphp/simplesamlphp": "^2.6",
+        "simplesamlphp/simplesamlphp": "^2.5@dev",
         "symfony/ldap": "^7.4"
     },
     "require-dev": {