[FEA] Adapt to `Series.str.cat` index dtype changes in pandas 3.0
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feature request
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Description
In pandas 3.0, `Series.str.cat` when passing an `other` of pandas objects will now return a `Series.index` of a type that is a result of a `concat` of all the indexes. Before, the callers `Series.index` was just used in the result.
This is a cause of the xfails in `test_string_cat`
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