ENH: Latest json schema metaschema.

src/caosadvancedtools/json_schema_exporter.py

@@ -442,7 +442,7 @@ out : dict
         "properties": sub_schemas,
         "required": required,
         "additionalProperties": False,
-        "$schema": "https://json-schema.org/draft/2019-09/schema",
+        "$schema": "https://json-schema.org/draft/2020-12/schema",
     }
 
     return result