Use v5 of saml2

Author: tvdijen

composer.json

@@ -39,7 +39,7 @@
 
         "simplesamlphp/assert": "^1.1.0",
         "simplesamlphp/composer-module-installer": "^1.3.4",
-        "simplesamlphp/saml2": "^4.6.0",
+        "simplesamlphp/saml2": "^5@dev",
 
         "simplesamlphp/simplesamlphp": "^2.1.0",
         "symfony/http-foundation": "^6.4.0"