[BUG] Pandas 3 support

[cmacdonald]

Our github action unit testing for ir_measures has observed that ranx fails on Pandas 3

        assert (
>           df[q_id_col].dtype == "O"
        ), "DataFrame Query IDs column dtype must be `object` (string)"
E       AssertionError: DataFrame Query IDs column dtype must be `object` (string)

The fix should be straightforward by relaxing the dtype to be object or the new pandas dtype for string.