Add allowed license for json (#1942)

For some reason `./gradlew clean build` on master is failing for me on
multiple machines due to a new org.json:json version triggering license
violations, even though the lock files are not changing.

Note that the old versions are still present because if I remove
"The JSON license", which the old versions use, the check also fails...

config/dependency-license/allowed_licenses.json

@@ -270,6 +270,10 @@
       "moduleLicense": "Public Domain",
       "moduleName": "org.tukaani:xz"
     },
+    {
+      "moduleLicense": "Public Domain",
+      "moduleName": "org.json:json"
+    },
     {
       // "Apache License, Version 2.0".
       "moduleLicense": null,