fix: claimed handlers include client handlers

The claimed handlers already include the client cluster
handlers, so we should not execute on them twice.

Author: elupus

zha/zigbee/endpoint.py

@@ -225,10 +225,8 @@ async def _execute_handler_tasks(
         self, func_name: str, *args: Any, max_concurrency: int | None = None
     ) -> None:
         """Add a throttled cluster handler task and swallow exceptions."""
-        cluster_handlers = [
-            *self.claimed_cluster_handlers.values(),
-            *self.client_cluster_handlers.values(),
-        ]
+        cluster_handlers = [*self.claimed_cluster_handlers.values()]
+
         tasks = [getattr(ch, func_name)(*args) for ch in cluster_handlers]
 
         gather: Callable[..., Awaitable]