Tweak composer dependencies

Limits compatibility to neos/neos 8.x since the change seems to require that version

Author: bwaidelich

composer.json

@@ -4,7 +4,7 @@
     "name": "flowpack/restrictcreation",
     "license": "MIT",
     "require": {
-        "neos/neos": "^3.0|^4.0|^5.0|^7.0|^8.0"
+        "neos/neos": "^8.0"
     },
     "autoload": {
         "psr-4": {