TASK: Set dependency on Flow 4.0

Author: robertlemke

composer.json

@@ -4,6 +4,7 @@
     "description": "Implements concrete Queue for the doctrine work queue. Requires the packages flowpack/jobqueue-common to be installed.",
     "license": "MIT",
     "require": {
+        "neos/flow": "~4.0",
         "flowpack/jobqueue-common": "^2.0"
     },
     "autoload": {