Add a source field for the clusters (required for MISP 2.4.56)

clusters/threat-actors.json

@@ -9,6 +9,7 @@
     "Timo Steffens",
     "Various"
   ],
+  "source": "MISP Project",
   "type": "threat-actors",
   "name": "Threat actor",
   "values": [

clusters/tools.json

@@ -634,6 +634,7 @@
   "uuid": "0d821b68-9d82-4c6d-86a6-1071a9e0f79f",
   "description": "threat-actor-tools is an enumeration of tools used by adversaries. The list includes malware but also common software regularly used by the adversaries.",
   "author": ["Alexandre Dulaunoy", "Florian Roth", "Timo Steffens", "Christophe Vandeplas"],
+  "source": "MISP Project",
   "type": "tools",
   "name": "Tool"
 }