Fix flakey utility meter test (home-assistant#111400)

The test tooling would cancel setup at teardown because
it was still setting up

https://github.com/home-assistant/core/actions/runs/8039593463/job/21956908225?pr=111336

tests/components/utility_meter/test_init.py

@@ -347,6 +347,7 @@ async def test_both_cron_and_meter(hass: HomeAssistant) -> None:
     }
 
     assert await async_setup_component(hass, DOMAIN, config)
+    await hass.async_block_till_done()
 
 
 async def test_cron_and_offset(hass: HomeAssistant) -> None: