Incorrect handling of `np.datetime64[ns]` date values

[taldcroft]

Dates specified using numpy datetime64 with [ns] precision are handled incorrectly in plotting. Dates with microsec [us] precision or lower work as expected.

t0 = np.datetime64("2022-10-20T00:00:00").astype("datetime64[ns]")
t1 = np.datetime64("2022-10-21T00:00:00").astype("datetime64[ns]")

fig = go.Figure()
fig.add_trace(go.Scatter(x=[t0, t1], y=[3, 4], mode="lines"))
fig.show()

[AaronStiff]

This is indeed a bug. However, a workaround would be to use plotly.express as the issue is not present there.