use built-in cached_property function

cloudsplaining/scan/statement_detail.py

@@ -3,9 +3,9 @@
 from __future__ import annotations
 
 import logging
+from functools import cached_property
 from typing import Any
 
-from cached_property import cached_property
 from policy_sentry.analysis.expand import determine_actions_to_expand
 from policy_sentry.querying.actions import (
     get_actions_matching_arn,
@@ -166,15 +166,15 @@ def has_not_resource_with_allow(self) -> bool:
         return False
 
     @cached_property
-    def expanded_actions(self) -> list[str] | None:
+    def expanded_actions(self) -> list[str]:
         """Expands the full list of allowed actions from the Policy/"""
 
         if self.actions:
             expanded: list[str] = determine_actions_to_expand(self.actions)
             expanded.sort()
             return expanded
         if self.not_action:
-            return self.not_action_effective_actions
+            return self.not_action_effective_actions or []
 
         raise Exception(  # pragma: no cover
             "The Policy should include either NotAction or Action in the statement."

pyproject.toml

@@ -25,11 +25,9 @@ requires-python = ">=3.10"
 dependencies = [
     "boto3>=1.40.0,<2.0.0",
     "botocore>=1.40.0,<2.0.0",
-    "cached-property>=2.0.0,<3.0.0",
     "click>=8.1.0,<9.0.0",
     "click_option_group>=0.5.9,<0.6.0",
     "jinja2>=3.1.0,<4.0.0",
-    "markdown>=3.9,<4.0",
     "policy_sentry>=0.14.0,<0.15",
     "pyyaml>=6.0.0,<7.0.0",
     "schema>=0.7.0,<0.8.0",
@@ -100,7 +98,6 @@ disallow_untyped_decorators = false
 [[tool.mypy.overrides]]
 module = [
     "schema",
-    "cached_property",
 ]
 ignore_missing_imports = true