Remove unused async keyword from Dispatcher.start

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

RELEASE_NOTES.md

@@ -6,6 +6,7 @@ This release introduces a more flexible and powerful mechanism for managing disp
 
 ## Upgrading
 
+* `Dispatcher.start` is no longer `async`. Remove `await` when calling it.
 * Two properties have been replaced by methods that require a type as parameter.
     * `Dispatcher.lifecycle_events` has been replaced by the method `Dispatcher.new_lifecycle_events_receiver(self, dispatch_type: str)`.
     * `Dispatcher.running_status_change` has been replaced by the method `Dispatcher.new_running_state_event_receiver(self, dispatch_type: str, unify_running_intervals: bool)`.

src/frequenz/dispatch/_dispatcher.py

@@ -179,7 +179,7 @@ def __init__(
             self._client,
         )
 
-    async def start(self) -> None:
+    def start(self) -> None:
         """Start the local dispatch service."""
         self._bg_service.start()