Add support for pandas>=3.0.0#602
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Fix compatibility with pandas 3.0, which defaults to `StringDtype` instead of `object` for string columns and uses different NA sentinels (pandas-dev/pandas#54792).
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pandas<3.0.0pin inpyproject.tomlMultiCategoricalTensorMapperintorch_frame/data/mapper.pyto support pandas 3.0, which usesStringDtypeinstead ofobjectfor string columns andpd.NAinstead ofnp.nanfor missing values (TRACKER: new default String dtype (pyarrow-backed, numpy NaN semantics) pandas-dev/pandas#54792)