Increasing waiting time after starting mock microgrid

Some unit tests still failing because microgrid server starts
to slow.

Signed-off-by: ela-kotulska-frequenz <[email protected]>

Author: ela-kotulska-frequenz

tests/timeseries/mock_microgrid.py

@@ -79,7 +79,7 @@ async def start(self) -> Tuple[Sender[ComponentMetricRequest], ChannelRegistry]:
                 channel registry.
         """
         await self._server.start()
-        await asyncio.sleep(0.1)
+        await asyncio.sleep(0.2)
         ret = await self._init_client_and_actors()
         await asyncio.sleep(0.1)
         return ret