Set version constraints

Author: tvdijen

composer.json

@@ -32,9 +32,10 @@
     },
     "require": {
         "php": "^8.0",
+
         "simplesamlphp/assert": "^1.0.0",
         "simplesamlphp/composer-module-installer": "^1.3.4",
-        "simplesamlphp/simplesamlphp": "^3@dev",
+        "simplesamlphp/simplesamlphp": "^2.0",
         "simplesamlphp/xml-common": "^1.12",
         "symfony/http-foundation": "^6.0"
     },