Potential regression induced by REF: use maybe_convert_objects in pd.array

[DeaMariaLeon]

PR #56484

If it is expected please ignore or close this issue.

Benchmark:
indexing.CategoricalIndexIndexing.time_getitem_list (Python) with index='monotonic_decr'

@jbrockmendel
http://57.128.112.95:5000/benchmark-results/0662a0dc8035706a80005a2ad6651f18/