Fix deprecation for PHP 8.2

Author: tvdijen

composer.json

@@ -36,8 +36,7 @@
     "require-dev": {
         "ext-xmlreader": "*",
 
-        "simplesamlphp/simplesamlphp-test-framework": "^1.2.1",
-        "vimeo/psalm": "^5.0.0-beta1"
+        "simplesamlphp/simplesamlphp-test-framework": "^1.2.1"
     },
     "support": {
         "issues": "https://github.com/simplesamlphp/xml-common/issues",