Fix import issue in value_nodes.py

MyPy complains that `override` should be imported from the typing_extensions package, but Python docs show that `override` exists in typing as of 3.12.

Author: rob-ross

killerbunny/evaluating/value_nodes.py

@@ -12,7 +12,7 @@
 import json
 import logging
 from typing import Iterator, Generator
-from typing_extensions import override
+from typing import override  # type: ignore
 from killerbunny.evaluating.evaluator_types import EvaluatorValue, NormalizedJPath
 from killerbunny.parsing.helper import unescape_string_content
 from killerbunny.shared.json_type_defs import JSON_ValueType