GH-113528: Deoptimise pathlib._abc.PurePathBase.relative_to()
#113529
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Replace use of `_from_parsed_parts()` with `with_segments()` in `PurePathBase.relative_to()`, and move the assignment of `_drv`, `_root`, `_tail_cached` and `_str` slots into `PurePath.relative_to()`. Also shuffle a deprecation warning into `PurePath.relative_to()` to ensure it's raised at the right stack level, and do the same in `is_relative_to()` for code consistency.
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Replace use of
_from_parsed_parts()withwith_segments()inPurePathBase.relative_to(), and move the assignment of_drv,_rootand_tail_cachedslots intoPurePath.relative_to().