update expected schema template

Author: SageGJ

tests/unit/synapseclient/extensions/unit_test_create_json_schema.py

@@ -271,6 +271,7 @@ def test_as_json_schema_dict(self) -> None:
             "$id": "",
             "$schema": "http://json-schema.org/draft-07/schema#",
             "description": "TBD",
+            "pattern": "",
             "properties": {},
             "required": [],
             "title": "",