pola-rs/polars: Python Polars 0.18.4

Performance improvements don't initialize memory before row-encoding (#9435) further optimize datetime conversion (#9452) speedup datetime conversion (#9432) reduce page faults in q1 ~-30% (#9423) reduce rayon/idle time in streaming (#9416) ✨ Enhancements add drop_first parameter for to_dummies (issue #8246) (#9143) raise if window size in rolling functions isn't strictly positive (#9465) serializable python functions in expressions (#9462) add infer schema len to json_extract (#9478) Adds (Most) Remaining Trig Functions to SQLContext (#9453) update error handling msg for sql functions (#9474) Update LazyFrame.__repr__ (#9460) support inversion of first \& last selectors, additional minor repr improvements (#9456) add str.titlecase (#9457) raise if period is negative in groupby_rolling (#9445) enhanced polars.selectors repr and implicit application of as_expr when broadcasting (#9450) add SQL round support (#9330) dont error for time-zone-aware parsing if time zone is UTC (#9414) Bug fixes ensure that trying to use a string as a dtype raises a consistent error on both DataFrame and Series init (#9493) fix race condition in out-of-core sort (#9521) unset sortedness for local date and local datetime (#9515) maintain sortedness flags on append/extend (#9496) fix serde for small integer dtypes (#9495) raise if window size in rolling functions isn't strictly positive (#9465) Fix empty list or Series selections on DF or Series (#8660) groupby rolling with negative offset (#9428) pl.lit with datetime was producing slightly incorrect results (#9438) read_csv was parsing dates incorrectly when the dtype was overridden (#9420) Compute Spearman rank correlations using average ra… (#9415) Fix rolling min/max when window is empty (#9406) ️ Other improvements don't pickle pyarrow dataset (#9523) fix rendering of examples (#9482) Warn for future change of closed default value in rolling functions (#9470) Document aggregate_function=None in pivot (#9473) Docstrings for expressions and dtypes (#9351) fix typo in rolling_* docstrings (#9449) Deprecate some expr input parsing behavior (#9455) improve date-range docs (#9451) Improve docstrings rolling functions (#9215) Remove _tempdir module references (#9427) fix typo in Series.qcut (#9421) Add some documentation on the CI workflows (#9404) Thank you to all our contributors for making this release possible! @EdmundsEcho, @MarcoGorelli, @SeanTroyUWO, @alexander-beedie, @baggiponte, @braaannigan, @datapythonista, @magarick, @mcrumiller, @messense, @mgperry, @mishpat, @ritchie46, @stinodego, @tarrafil, @universalmind303 and @zundert