TASK: Declare compatibility with Flow 9

Based on the current state, this package does work with Flow 9.0 dev

Author: robertlemke

composer.json

@@ -5,7 +5,7 @@
     "license": "MIT",
     "require": {
         "php": "^7.4 || ^8.0",
-        "neos/flow": "^6.3 || ^7.0 || ^8.0 || dev-master",
+        "neos/flow": "^6.3 || ^7.0 || ^8.0 || ^9.0",
         "neos/cache": "*"
     },
     "autoload": {