chore(mypy): add leftover assignment ignore

Author: heitorlessa

examples/event_handler_rest/src/split_route_prefix_module.py

@@ -13,7 +13,7 @@
 @router.get("/")
 @tracer.capture_method
 def get_todos():
-    api_key: str = router.current_event.get_header_value(name="X-Api-Key", case_sensitive=True, default_value="")
+    api_key: str = router.current_event.get_header_value(name="X-Api-Key", case_sensitive=True, default_value="")  # type: ignore[assignment] # sentinel typing # noqa: E501
 
     todos: Response = requests.get(endpoint, headers={"X-Api-Key": api_key})
     todos.raise_for_status()