Fix version constraint

Author: tvdijen

composer.json

@@ -34,7 +34,7 @@
         "php": "^8.0",
         "simplesamlphp/assert": "^1.0.0",
         "simplesamlphp/composer-module-installer": "^1.3.4",
-        "simplesamlphp/simplesamlphp": "3.0.x-dev",
+        "simplesamlphp/simplesamlphp": "^3@dev",
         "simplesamlphp/xml-common": "^1.12",
         "symfony/http-foundation": "^6.0"
     },