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Hello there. Did any of you had the same issue on using .serve():  AttributeError: 'Flow' object has no attribute 'serve'. The prefect version used is as below (for those of you that had it working, which version of prefect is used?)

What's the full code that's executing here?

```import httpx
from prefect import flow


@flow()
def fetch_weather(lat: float = 38.9, lon: float = -77.0):
    base_url = "<https://api.open-meteo.com/v1/forecast/>"
    temps = httpx.get(
        base_url,
        params=dict(latitude=lat, longitude=lon, hourly="temperature_2m"),
    )
    forecasted_temp = float(temps.json()["hourly"]["temperature_2m"][0])
    print(f"Forecasted temp C: {forecasted_temp} degrees")
    return forecasted_temp


if __name__ == "__main__":
    fetch_weather.serve(name="deploy-1")```

This could happen if an old version of Prefect is being used. What does `prefect version` show?