TASK: Fix SPDX license identifier in composer manifest

Author: kdambekalns

composer.json

@@ -3,7 +3,7 @@
     "type": "neos-package",
     "description": "This package provides functionality for using Elasticsearch on top of Neos.ContentRepository.Search",
     "homepage": "http://flowpack.org/",
-    "license": "LGPL-3.0",
+    "license": "LGPL-3.0-only",
     "require": {
         "php": ">=7.0",
         "flowpack/elasticsearch": "^2.0",