Fix flapping system log test (#78391)
Fix flapping system log test (#78391)

Since we run tests with asyncio debug on, there is
a chance we will get an asyncio log message instead
of the one we want

Fixes https://github.com/home-assistant/core/actions/runs/3045080236/jobs/4906717578
mezz64/home-assistant,w1ll1am23/home-assistant,mezz64/home-assistant,nkgilley/home-assistant,w1ll1am23/home-assistant,nkgilley/home-assistant