Deprecation warnings from pandas

[prokie]

With pandas 1.4 or later I am getting deprecations warnings from figure_resampler.py

pandas.UInt64Index is deprecated and will be removed from pandas in a future version. Use pandas.Index with the appropriate dtype instead.

[jvdd]

We check whether the index datatype is integer on this line:

plotly-resampler/plotly_resampler/figure_resampler.py

Line 189 in 1c309d6

if isinstance(hf_series.index, (pd.Int64Index, pd.UInt64Index)):

Appearantly both pd.Int64Index and pd.UInt64Index are deprecated since pandas v1.4.0 (and will be removed in pandas v2.0).

pandas-dev/pandas#41153

So, in order to comply with pandas its updated index handling, we should check whether the index is a pd.NumericIndex of integer dtype.