Use SSP 2.3

Author: tvdijen

composer.json

@@ -39,7 +39,7 @@
         "simplesamlphp/assert": "^0.8 || ^1.0",
         "simplesamlphp/cas": "^1.0",
         "simplesamlphp/composer-module-installer": "^1.3.4",
-        "simplesamlphp/simplesamlphp": "^3@dev",
+        "simplesamlphp/simplesamlphp": "^2.3",
         "simplesamlphp/simplesamlphp-module-ldap": "~1.2",
         "symfony/http-foundation": "^6.4"
     },