Make kind argument in CFTimeIndex._maybe_cast_slice_bound optional
#5359
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Pandas recently deprecated the
kindargument inIndex._maybe_cast_slice_bound, and removed its use in several internal calls: pandas-dev/pandas#41378. This led to some errors in the CFTimeIndex tests in our upstream build. We never made use of it inCFTimeIndex._maybe_cast_slice_boundso the simplest fix for backwards compatibility seems to be to make it optional for now -- in previous versions of pandas it was required -- and remove it when our minimum version of pandas is at least 1.3.0.pre-commit run --all-fileswhats-new.rst