Downgrade saml2-lib

Author: tvdijen

composer.json

@@ -36,7 +36,7 @@
     "require": {
         "php": "^8.1",
 
-        "simplesamlphp/saml2": "~5.0.1",
+        "simplesamlphp/saml2": "~4.17.0",
         "simplesamlphp/simplesamlphp": "`2.4.0",
         "symfony/http-foundation": "~6.4.0"
     },