[FEATURE]: filter warnings due to pandas index deprecation

[thomasastanley]

I just created a new env with
xarray 0.20.2 pyhd8ed1ab_0 conda-forge

when pandas 1.4 is also installed, it generates a ton of warnings due to deprecated indices.

the workaround is to roll back to pandas 1.3:

pandas 1.3.5 py310hb5077e9_0 conda-forge

Describe the solution you'd like

filter the warnings that come from this deprecation: https://pandas.pydata.org/docs/whatsnew/v1.4.0.html#deprecated-int64index-uint64index-float64index

possibly this is addressed here, i don't know: #6195

Describe alternatives you've considered

in the long run, i suppose the way the indices themselves must be replaced, rather than just silencing the warnings.

[max-sixty]

Thanks @thomasastanley — you're right this is covered by #6195