Fix lint and type issues

Author: ZohebShaikh

CHANGELOG.md

@@ -10,7 +10,7 @@ Write the date in place of the "Unreleased" in the case a new version is release
 - Optional `persist` query parameter to PUT and PATCH /array/... routes, and
   the corresponding DaskArrayClient methods: `write`, `write_block`, `patch`.
 - Added new delete:node and delete:revision scopes
-- Add ExternalPolicyDecision for authorization and an example working with Open Policy Agent 
+- Add ExternalPolicyDecisionPoint for authorization and an example working with Open Policy Agent
 
 ### Changed
 

tiled/access_control/access_policies.py

@@ -468,7 +468,7 @@ async def _get_external_decision(
         decision_endpoint: str,
         principal: Principal,
         access_blob: Optional[AccessBlob] = None,
-    ) -> Optional[List[str] | bool]:
+    ) -> Optional[Union[List[str], bool]]:
         input = Input(
             input=Data(
                 token=self._identifier(principal),