fix 3.11 support

Author: khvn26

pyproject.toml

@@ -26,6 +26,8 @@ optional-dependencies = { test-tools = [
     "django (>4,<5)",
     "django-health-check",
     "prometheus-client (>=0.0.16)",
+], flagsmith-models = [
+    "typing_extensions",
 ] }
 authors = [
     { name = "Matthew Elwell" },

src/flagsmith_models/__init__.py

@@ -4,9 +4,11 @@
 """
 
 from datetime import datetime
-from typing import Literal, NotRequired, TypeAlias, TypedDict
+from typing import Literal, TypeAlias
 from uuid import UUID
 
+from typing_extensions import NotRequired, TypedDict
+
 FeatureType = Literal["STANDARD", "MULTIVARIATE"]
 """Represents the type of a Flagsmith feature. Multivariate features include multiple weighted values."""