TASK: Update composer constraints to require at least FLow 5.1

Author: daniellienert

composer.json

@@ -4,8 +4,9 @@
   "description": "Neos CMS Elasticsearch indexer based on a job queue",
   "license": "MIT",
   "require": {
+    "neos/flow": "^5.1 || ^6.0",
     "flowpack/jobqueue-common": "^3.0 || dev-master",
-    "flowpack/elasticsearch-contentrepositoryadaptor": "^6.0 || dev-master"
+    "flowpack/elasticsearch-contentrepositoryadaptor": "^5.0 || ^6.0 || dev-master"
   },
   "autoload": {
     "psr-4": {