Fix `xarray.backends` imports #148

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6 warnings

Config for ecmwf/plume-plugin-axe@main not found.

Config for ecmwf/plume-plugin-wind-farm@main not found.

Config for ecmwf/kronos@master not found.

Config for ecmwf/infero@master not found.

Config for ecmwf/polytope@main not found.

Config for ecmwf/atlas-orca@master not found.