Relax composer dependencies for Neos 9

Author: mficzel

composer.json

@@ -5,7 +5,7 @@
     "license": "LGPL-3.0+",
     "require": {
         "php": "^8.1",
-        "neos/flow": "^8.3",
+        "neos/flow": "^8.3 || ^9.0",
         "lmc/http-constants": "^1.2"
     },
     "autoload": {