Update composer.json

Author: BrianGilbert

composer.json

@@ -22,7 +22,7 @@
   ],
   "require": {
     "php": "^5.6.0|^7.0|^8.0|^8.1",
-    "simplesamlphp/simplesamlphp": "^2.0.0",
+    "simplesamlphp/simplesamlphp": "dev-simplesamlphp-2.1",
     "simplesamlphp/composer-module-installer": "~1.0"
   },
   "require-dev": {