update_manager: return True when on update success

All calls to update now return a boolean value.  When performing a full upate this return value is used to
check if Moonraker should wait for Klippy to reconnect.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/components/update_manager/base_deploy.py

@@ -32,8 +32,8 @@ class BaseDeploy:
     async def refresh(self) -> None:
         pass
 
-    async def update(self) -> None:
-        pass
+    async def update(self) -> bool:
+        return False
 
     def get_update_status(self) -> Dict[str, Any]:
         return {}